D3.js 使用缩放zoom时节点无法拖动,只能整体移动的问题

   .on("dragstart", function() {
        d3.event.sourceEvent.stopPropagation();
    })

https://stackoverflow.com/questions/31692431/d3-js-drag-is-disabled-when-use-zoom  

文章来自:http://www.cnblogs.com/leyi/p/6909370.html
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