|  | 
 | <!-- | 
 | Licensed to the Apache Software Foundation (ASF) under one | 
 | or more contributor license agreements.  See the NOTICE file | 
 | distributed with this work for additional information | 
 | regarding copyright ownership.  The ASF licenses this file | 
 | to you under the Apache License, Version 2.0 (the | 
 | "License"); you may not use this file except in compliance | 
 | with the License.  You may obtain a copy of the License at | 
 |  | 
 |    http://www.apache.org/licenses/LICENSE-2.0 | 
 |  | 
 | Unless required by applicable law or agreed to in writing, | 
 | software distributed under the License is distributed on an | 
 | "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | 
 | KIND, either express or implied.  See the License for the | 
 | specific language governing permissions and limitations | 
 | under the License. | 
 | --> | 
 |  | 
 | <html> | 
 |     <head> | 
 |         <meta charset="utf-8"> | 
 |         <script src="lib/simpleRequire.js"></script> | 
 |         <script src="lib/config.js"></script> | 
 |         <script src="lib/jquery.min.js"></script> | 
 |         <script src="lib/facePrint.js"></script> | 
 |         <script src="lib/testHelper.js"></script> | 
 |         <link rel="stylesheet" href="lib/reset.css" /> | 
 |         <meta name="viewport" content="user-scalable=no,width=device-width,height=device-height"> | 
 |     </head> | 
 |     <body> | 
 |         <style> | 
 |             .test-title { | 
 |                 background: #146402; | 
 |                 color: #fff; | 
 |             } | 
 |         </style> | 
 |  | 
 |         <div id="main0"></div> | 
 |         <div id="main1"></div> | 
 |         <div id="main2"></div> | 
 |         <div id="main3"></div> | 
 |         <div id="main4"></div> | 
 |  | 
 |  | 
 |  | 
 |  | 
 |         <script> | 
 |  | 
 |             require([ | 
 |                 'echarts' | 
 |             ], function (echarts) { | 
 |  | 
 |                 var option = { | 
 |                     tooltip: { | 
 |                         trigger: 'axis' | 
 |                     }, | 
 |                     legend: { | 
 |                         data: ['pm0.5', 'pm2.5'] | 
 |                     }, | 
 |                     grid: { | 
 |                         top: '18%', | 
 |                         left: '3%', | 
 |                         right: '8%', | 
 |                         bottom: '3%', | 
 |                         containLabel: true | 
 |                     }, | 
 |                     xAxis: { | 
 |                         type: 'category', | 
 |                         boundaryGap: false, | 
 |                         data: ['4-1', '4-2', '4-3', '4-4', '4-5', '4-6'] | 
 |                     }, | 
 |                     yAxis: { | 
 |                         type: 'log', | 
 |                         axisLabel: { | 
 |                             formatter: function(value) { | 
 |                                 return value === 0.1 ? 0 : value | 
 |                             } | 
 |                         } | 
 |                     }, | 
 |                     series: [{ | 
 |                             name: 'pm0.5', | 
 |                             type: 'line', | 
 |                             areaStyle: { | 
 |                                 //color: 'cyan' | 
 |                             }, | 
 |                             emphasis: { | 
 |                                 focus: 'series' | 
 |                             }, | 
 |                             // lineStyle: { | 
 |                             //     color: '#FEC171' | 
 |                             // }, | 
 |                             data: [15, 200, 3000, 50000, 1200000], | 
 |                             markLine: { | 
 |                                 data: [{ | 
 |                                     name: `Y 轴值为 150 的水平线`, | 
 |                                     yAxis: 150 | 
 |                                 }], | 
 |                                 lineStyle: { | 
 |                                     color: '#30B08F' | 
 |                                 } | 
 |                             } | 
 |                         }, | 
 |                         { | 
 |                             name: 'pm2.5', | 
 |                             type: 'line', | 
 |                             areaStyle: { | 
 |                                 // color: 'blue' | 
 |                             }, | 
 |                             emphasis: { | 
 |                                 focus: 'series' | 
 |                             }, | 
 |                             // lineStyle: { | 
 |                             //     color: '#409EFF' | 
 |                             // }, | 
 |                             data: [1200000, 50000, 3000, 200, 15], | 
 |                             markLine: { | 
 |                                 data: [{ | 
 |                                     name: `X 轴值为 4-2 的水平线`, | 
 |                                     xAxis: '4-2' | 
 |                                 }], | 
 |                                 lineStyle: { | 
 |                                     color: 'red' | 
 |                                 } | 
 |                             } | 
 |                         } | 
 |                     ], | 
 |                     visualMap: { | 
 |                         // show: false, | 
 |                         pieces: [{ | 
 |                             gte: 0, | 
 |                             lte: 150, | 
 |                             color: '#30B08F' | 
 |                         }, { | 
 |                             gt: 150, | 
 |                             color: '#C03639' | 
 |                         }], | 
 |                         outOfRange: { | 
 |                             color: 'gray' | 
 |                         }, | 
 |                         right: '10%', | 
 |                         bottom: '10%', | 
 |                         orient: 'vertical' | 
 |                     }, | 
 |                     dataZoom: [{ | 
 |                         type: 'inside' | 
 |                     }] | 
 |                 }; | 
 |  | 
 |                 testHelper.create(echarts, 'main0', { | 
 |                     title: [ | 
 |                         'The series with log axis should be rendered without errors in console', | 
 |                         'https://github.com/apache/echarts/issues/14601' | 
 |                     ], | 
 |                     option: option | 
 |                 }); | 
 |  | 
 |             }) | 
 |  | 
 |         </script> | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |  | 
 |         <script> | 
 |  | 
 |             require([ | 
 |                 'echarts' | 
 |             ], function (echarts) { | 
 |  | 
 |                 var option = { | 
 |                     xAxis: { | 
 |                         data: [0, 1] | 
 |                     }, | 
 |                     yAxis: { | 
 |                         type: 'value' | 
 |                     }, | 
 |                     series: [ | 
 |                         { | 
 |                             name: '会员数-周同比', | 
 |                             type: 'line', | 
 |                             data: [ | 
 |                                 { | 
 |                                     value: null | 
 |                                 }, | 
 |                                 { | 
 |                                     value: null | 
 |                                 } | 
 |                             ], | 
 |                             areaStyle: { | 
 |                                 color: { | 
 |                                     type: 'linear', | 
 |                                     x: 0, | 
 |                                     y: 0, | 
 |                                     x2: 0, | 
 |                                     y2: 1, | 
 |                                     index: 6, | 
 |                                     colorStops: [ | 
 |                                         { | 
 |                                             offset: 0, | 
 |                                             color: 'rgba(235, 83, 46, 0.30)' | 
 |                                         }, | 
 |                                         { | 
 |                                             offset: 1, | 
 |                                             color: 'rgba(235, 83, 6, 0.05)' | 
 |                                         } | 
 |                                     ] | 
 |                                 } | 
 |                             } | 
 |                         } | 
 |                     ] | 
 |                 }; | 
 |  | 
 |                 testHelper.create(echarts, 'main1', { | 
 |                     title: [ | 
 |                         'Nothing should be rendered without errors in console', | 
 |                         'https://github.com/apache/echarts/issues/14534' | 
 |                     ], | 
 |                     option: option | 
 |                 }); | 
 |             }); | 
 |  | 
 |         </script> | 
 |  | 
 |         <script> | 
 |             require(['echarts'], function (echarts) { | 
 |                 var option = { | 
 |                     tooltip: { | 
 |                         trigger: 'axis' | 
 |                     }, | 
 |                     xAxis: { | 
 |                         type: 'time' | 
 |                     }, | 
 |                     yAxis: { | 
 |                         //type: 'log', | 
 |                         //logBase: 2 | 
 |                     }, | 
 |                     visualMap: { | 
 |                         top: 50, | 
 |                         right: 10, | 
 |                         pieces: [ | 
 |                             { | 
 |                                 "gte": 300, | 
 |                                 "lt": 400, | 
 |                                 "color": "#FF2E00" | 
 |                             }, | 
 |                             { | 
 |                                 "gte": 400, | 
 |                                 "color": "#D00000" | 
 |                             } | 
 |                         ], | 
 |                         outOfRange: { | 
 |                             color: '#999' | 
 |                         } | 
 |                     }, | 
 |                     dataZoom: [{ | 
 |                         startValue: '2014-06-01' | 
 |                     }, { | 
 |                         type: 'inside' | 
 |                     }], | 
 |                     series: { | 
 |                         name: 'Beijing AQI', | 
 |                         type: 'line', | 
 |                         data: [ | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626943980000, | 
 |                                     128 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944040000, | 
 |                                     186 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944100000, | 
 |                                     262 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944160000, | 
 |                                     231 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944220000, | 
 |                                     65 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944280000, | 
 |                                     200 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944340000, | 
 |                                     31 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944400000, | 
 |                                     241 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944460000, | 
 |                                     103 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944520000, | 
 |                                     172 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944580000, | 
 |                                     241 | 
 |                                 ] | 
 |                             }, | 
 |                             { | 
 |                                 "name": "474eb6f5", | 
 |                                 "value": [ | 
 |                                     1626944640000, | 
 |                                     222 | 
 |                                 ] | 
 |                             } | 
 |                         ] | 
 |                     } | 
 |                 }; | 
 |  | 
 |                 testHelper.create(echarts, 'main2', { | 
 |                     title: [ | 
 |                         'Line color should be correct when visualMap is enabled', | 
 |                         'Test case from https://github.com/apache/echarts/issues/15407' | 
 |                     ], | 
 |                     option: option | 
 |                 }); | 
 |             }); | 
 |         </script> | 
 |  | 
 |  | 
 |         <script> | 
 |             require([ | 
 |                 'echarts' | 
 |             ], function (echarts) { | 
 |                 var option = { | 
 |                     title: { | 
 |                         text: 'Awesome Chart' | 
 |                     }, | 
 |                     xAxis: { | 
 |                         data: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'] | 
 |                     }, | 
 |                     yAxis: {}, | 
 |                     series: [{ | 
 |                         type: 'line', | 
 |                         data:[220, 182, 191, 234, 290, 330, 310] | 
 |                     }] | 
 |                 }; | 
 |  | 
 |                 var $x = ["2020-08-20","2020-08-21","2020-08-24","2020-08-25","2020-08-26","2020-08-27","2020-08-28","2020-08-31","2020-09-01","2020-09-02","2020-09-03","2020-09-04","2020-09-07","2020-09-08","2020-09-09","2020-09-10","2020-09-11","2020-09-14","2020-09-15","2020-09-16","2020-09-17","2020-09-18","2020-09-21","2020-09-22","2020-09-23","2020-09-24","2020-09-25","2020-09-28","2020-09-29","2020-09-30","2020-10-09","2020-10-12","2020-10-13","2020-10-14","2020-10-15","2020-10-16","2020-10-19","2020-10-20","2020-10-21","2020-10-22","2020-10-23","2020-10-26","2020-10-27","2020-10-28","2020-10-29","2020-10-30","2020-11-02","2020-11-03","2020-11-04","2020-11-05","2020-11-06","2020-11-09","2020-11-10","2020-11-11","2020-11-12","2020-11-13","2020-11-16","2020-11-17","2020-11-18","2020-11-19","2020-11-20","2020-11-23","2020-11-24","2020-11-25","2020-11-26","2020-11-27","2020-11-30","2020-12-01","2020-12-02","2020-12-03","2020-12-04","2020-12-07","2020-12-08","2020-12-09","2020-12-10","2020-12-11","2020-12-14","2020-12-15","2020-12-16","2020-12-17","2020-12-18","2020-12-21","2020-12-22","2020-12-23","2020-12-24","2020-12-25","2020-12-28","2020-12-29","2020-12-30","2020-12-31","2021-01-04","2021-01-05","2021-01-06","2021-01-07","2021-01-08","2021-01-11","2021-01-12","2021-01-13","2021-01-14","2021-01-15","2021-01-18","2021-01-19","2021-01-20","2021-01-21","2021-01-22","2021-01-25","2021-01-26","2021-01-27","2021-01-28","2021-01-29","2021-02-01","2021-02-02","2021-02-03","2021-02-04","2021-02-05","2021-02-08","2021-02-09","2021-02-10","2021-02-18","2021-02-19","2021-02-22","2021-02-23","2021-02-24","2021-02-25","2021-02-26","2021-03-01","2021-03-02","2021-03-03","2021-03-04","2021-03-05","2021-03-08","2021-03-09","2021-03-10","2021-03-11","2021-03-12","2021-03-15","2021-03-16","2021-03-17","2021-03-18","2021-03-19","2021-03-22","2021-03-23","2021-03-24","2021-03-25","2021-03-26","2021-03-29","2021-03-30","2021-03-31","2021-04-01","2021-04-02"]; | 
 |                 var $s1 = [-80.65,-86.61,-41.83,-39.31,-100.97,-58.66,-26.04,-32.31,14.12,39.83,19.21,-16.46,-61.23,-44.61,-83.63,-108.42,-87.37,-16.75,86.01,127.74,138.77,167.67,129.31,57.86,9.14,-75.93,-65.58,-64.7,20.89,39.63,97.85,122.55,145.86,105.62,72.92,17.18,-5.71,13.87,7.41,3.13,3.08,7.94,79.47,113.11,107.02,38.1,70.76,88.18,120.21,177.45,218.19,218.29,109.89,36.9,15.74,12.81,75.08,67.41,-34.81,-36.21,5.89,101.44,142.1,87.73,67.8,2.28,-16.82,-27.88,-66.38,-71.15,-12.86,37.25,83.19,55.59,27.63,5.28,36.55,57.71,50.83,48.45,124.18,178.82,145.43,164.9,172.07,257.96,207.87,31.93,22.09,4.51,102.32,187.61,221.54,258.44,191.55,154.41,207.77,74.65,-19.92,31.42,80.91,-10.89,-28.15,-10.46,96.9,109.09,77.61,61.25,-26.26,-141.56,-163.44,-53.97,-4.73,-37.68,-141.14,-68.32,46.82,99.67,138.99,76.05,62.87,-55.7,-207.52,-249,-312.76,-226.17,-178.23,-56.33,-105.31,-87.22,-161.42,-154.39,-74.05,-1.99,44.09,54.57,27.83,73.24,63.51,-11.81,-32.16,-71.25,-114.45,-85.86,24.54,37.87,70.85,5.39,-6.17,-19.2]; | 
 |                 var $s2 = [-55.49,-68.41,-61.64,-62.43,-90,-87.95,-79.76,-78.58,-56.39,-34.33,-27.7,-30.23,-44.81,-42.91,-57.64,-78.61,-87.8,-72.7,-31.45,7.92,41.01,83.05,104.38,102.8,94.82,57.47,38.31,16.42,25.8,26.09,46.42,65.78,95.32,105.37,110.95,97.78,84.58,82.19,70.97,57.39,44.26,34.51,56.02,80.42,93.87,79.69,92.03,106.32,131.8,170.17,207.85,231.99,210.5,181.18,161.55,147.01,155.14,143.67,88.45,56.76,50.55,81.03,112.24,106.37,98.84,74.3,59.59,49.39,24.13,-1.54,-2.91,4.93,25.82,29.11,25.45,21.39,36.92,54.57,62.69,65.07,95.86,134.43,148.59,175.69,198.91,254.38,268.96,214.63,189.98,163.54,181.34,215.44,238.47,263.28,258.15,253.43,287.76,254.08,200.49,187.08,181.75,131.91,96.99,71.55,93.33,105.24,100.14,95.11,61.05,-0.14,-39.99,-28.82,-22.62,-42.43,-98.76,-100.84,-59.76,-14.19,31.96,37.23,44.13,11.11,-55.07,-105.27,-171.08,-195.65,-216.26,-200.89,-222.13,-219.2,-241.55,-236.55,-199.42,-152.76,-112.2,-82.32,-68.81,-29.28,1.88,-1.44,-2.75,-21.51,-52.42,-60.72,-31.75,-21.33,-0.96,-14.81,-17.06,-15.39]; | 
 |                 var $visualMap1 = [{"gt":1,"lte":3,"color":"#ff0000"},{"gt":4,"lte":6,"color":"#ff0000"},{"gt":7,"lte":9,"color":"#ff0000"},{"gt":12,"lte":13,"color":"#ff0000"},{"gt":15,"lte":21,"color":"#ff0000"},{"gt":25,"lte":32,"color":"#ff0000"},{"gt":36,"lte":37,"color":"#ff0000"},{"gt":40,"lte":43,"color":"#ff0000"},{"gt":45,"lte":51,"color":"#ff0000"},{"gt":55,"lte":56,"color":"#ff0000"},{"gt":59,"lte":62,"color":"#ff0000"},{"gt":69,"lte":72,"color":"#ff0000"},{"gt":75,"lte":77,"color":"#ff0000"},{"gt":79,"lte":81,"color":"#ff0000"},{"gt":82,"lte":85,"color":"#ff0000"},{"gt":89,"lte":93,"color":"#ff0000"},{"gt":95,"lte":96,"color":"#ff0000"},{"gt":98,"lte":100,"color":"#ff0000"},{"gt":102,"lte":105,"color":"#ff0000"},{"gt":110,"lte":112,"color":"#ff0000"},{"gt":114,"lte":118,"color":"#ff0000"},{"gt":124,"lte":127,"color":"#ff0000"},{"gt":128,"lte":129,"color":"#ff0000"},{"gt":130,"lte":135,"color":"#ff0000"},{"gt":136,"lte":137,"color":"#ff0000"},{"gt":142,"lte":146,"color":"#ff0000"}]; | 
 |                 var $visualMap2 = [{"gt":1,"lte":2,"color":"#ff0000"},{"gt":4,"lte":10,"color":"#ff0000"},{"gt":12,"lte":13,"color":"#ff0000"},{"gt":16,"lte":22,"color":"#ff0000"},{"gt":27,"lte":34,"color":"#ff0000"},{"gt":41,"lte":44,"color":"#ff0000"},{"gt":45,"lte":51,"color":"#ff0000"},{"gt":55,"lte":56,"color":"#ff0000"},{"gt":60,"lte":62,"color":"#ff0000"},{"gt":70,"lte":73,"color":"#ff0000"},{"gt":75,"lte":86,"color":"#ff0000"},{"gt":89,"lte":93,"color":"#ff0000"},{"gt":95,"lte":96,"color":"#ff0000"},{"gt":103,"lte":105,"color":"#ff0000"},{"gt":110,"lte":112,"color":"#ff0000"},{"gt":115,"lte":120,"color":"#ff0000"},{"gt":126,"lte":127,"color":"#ff0000"},{"gt":128,"lte":129,"color":"#ff0000"},{"gt":130,"lte":138,"color":"#ff0000"},{"gt":143,"lte":146,"color":"#ff0000"},{"gt":148,"lte":149,"color":"#ff0000"}]; | 
 |  | 
 |                 option = { | 
 |                     dataZoom: [ | 
 |                     { | 
 |                         show: true, | 
 |                         type: 'slider', | 
 |                         top: '90%', | 
 |                         start: 85, | 
 |                         end: 100 | 
 |                     } | 
 |                     ], | 
 |                     xAxis: { | 
 |                         type: 'category', | 
 |                         boundaryGap: false, | 
 |                         data: $x | 
 |                     }, | 
 |                     yAxis: { | 
 |                         type: 'value', | 
 |                         axisLabel: { | 
 |                             formatter: '{value} W' | 
 |                         }, | 
 |                         axisPointer: { | 
 |                             snap: true | 
 |                         } | 
 |                     }, | 
 |                     visualMap: [{ | 
 |                         show: false, | 
 |                         seriesIndex: 0, // $s1 | 
 |                         dimension: 0, | 
 |                         pieces: $visualMap1, | 
 |                         outOfRange: { | 
 |                             color: 'green' | 
 |                         }, | 
 |                     }, { | 
 |                         show: false, | 
 |                         seriesIndex: 1, // $s2 | 
 |                         dimension: 0, | 
 |                         pieces: $visualMap2, //pieces的值由动态数据决定 | 
 |                         outOfRange: { | 
 |                             color: 'green' | 
 |                         }, | 
 |                     }], | 
 |                     series: [ | 
 |                         { | 
 |                             name: '用电量1', | 
 |                             type: 'line', | 
 |                             smooth: true, | 
 |                             data: $s1, | 
 |                             symbol: "none", | 
 |  | 
 |                         },{ | 
 |                             name: '用电量2', | 
 |                             type: 'line', | 
 |                             smooth: true, | 
 |                             data: $s2, | 
 |                             lineStyle: { | 
 |                                 opacity: 1, | 
 |                                 width: 1.5, | 
 |                                 type: 'dotted'  // 这个是虚线 dashed, dotted更密集 | 
 |                             }, | 
 |                             symbol: "none", | 
 |                         } | 
 |                     ] | 
 |                 }; | 
 |                 const myChart = testHelper.create(echarts, 'main3', { | 
 |                     title: [ | 
 |                         'Graident should have sharp stop on line chart in Chrome with GPU Acceleration enabled.', | 
 |                         'https://github.com/apache/echarts/issues/15680' | 
 |                     ], | 
 |                     button: [{ | 
 |                         text: 'zoomToLast', | 
 |                         onclick() { | 
 |                             myChart.setOption({ | 
 |                                 dataZoom: { | 
 |                                     start: 99, | 
 |                                     end: 100 | 
 |                                 } | 
 |                             }) | 
 |                         } | 
 |                     }, { | 
 |                         text: 'zoomToFirst', | 
 |                         onclick() { | 
 |                             myChart.setOption({ | 
 |                                 dataZoom: { | 
 |                                     start: 0, | 
 |                                     end: 1 | 
 |                                 } | 
 |                             }) | 
 |                         } | 
 |                     }, { | 
 |                         text: 'zoomToAll', | 
 |                         onclick() { | 
 |                             myChart.setOption({ | 
 |                                 dataZoom: { | 
 |                                     start: 0, | 
 |                                     end: 100 | 
 |                                 } | 
 |                             }) | 
 |                         } | 
 |                     }], | 
 |                     option: option | 
 |                 }); | 
 |             }) | 
 |  | 
 |         </script> | 
 |  | 
 |         <script> | 
 |             require([ | 
 |                 'echarts' | 
 |             ], function (echarts) { | 
 |  | 
 |                 const option = { | 
 |                     xAxis: { | 
 |                         type: 'category', | 
 |                         data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] | 
 |                     }, | 
 |                     yAxis: { | 
 |                         type: 'value' | 
 |                     }, | 
 |  | 
 |                     visualMap: { | 
 |                         type: "piecewise", | 
 |                         pieces: [{ | 
 |                                     gte: -1, | 
 |                                     lte: 1, | 
 |                                     color: '#000' | 
 |                                 }], | 
 |                         outOfRange: { color: '#F43915' } | 
 |                     }, | 
 |                     series: [ | 
 |                         { | 
 |                         data: [0.2, 0.24, 0.18, 0.15, 0.18, 0.27, 0.25], | 
 |                         type: 'line' | 
 |                         } | 
 |                     ] | 
 |                 }; | 
 |                 const myChart = testHelper.create(echarts, 'main4', { | 
 |                     title: [ | 
 |                         'Gradient should be black.', | 
 |                         'https://github.com/apache/echarts/issues/15885' | 
 |                     ], | 
 |                     option: option | 
 |                 }); | 
 |             }) | 
 |         </script> | 
 |     </body> | 
 | </html> |