baokeyu123 opened a new issue #14450:
URL: https://github.com/apache/echarts/issues/14450


   ### What problem does this feature solve?
   {
                   type: 'lines',
                   coordinateSystem: 'cartesian2d',
                   polyline: true,
                   effect: {
                       show: true,
                       trailLength: 0,
                       symbol: 'rect',
                       period: 12,  //滑动速度
                       symbolSize: [200, 15],
                       color: 'black',
                       loop: false,
                   },
                   data: [{
                       coords: [
                           [0, 0],
                           [Distance, 0] 
                       ]
                   },],
               }
   i don't set API loop:true ,because i want to update data and animation is 
synchronize,update data exist delay,so i have to rebuild lines animation
   
   thanks~
   
   ### What does the proposed API look like?
   replaceMerge  not flexible...
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->
   
   @plainheart  brother ,i need u help.hha


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