<分区>
我正在尝试让 ID 属性脱离 getElementById 方法，但它似乎返回 null 或未定义。我检查了我的 HTML，它确实有一个与之关联的 ID。我已经为我的所有列提供了不同的 ID，因此多次出现相同的 ID 不是问题。
var columnID = $(this).closest(".col-md-4.column").id;
console.log(columnID);
var column = document.getElementById(columnID);
<div class="row" id="columns">
<div class="col-md-4 column" id="col1">
<div class="panel panel-default" draggable="true">
<div class="panel-heading">
<h3 class="panel-title">
Panel title
<span class="glyphicon glyphicon-pencil panel-icons"></span>
<span class="glyphicon glyphicon-zoom-in panel-icons"></span>
<span class="glyphicon glyphicon-trash panel-icons"></span>
</h3>
</div>
<div class="panel-body" id="testchart">
CHART GOES HERE
</div>
</div>
<div class="panel panel-default" draggable="true">
<div class="panel-heading">
<h3 class="panel-title">
Panel title
<span class="glyphicon glyphicon-pencil panel-icons"></span>
<span class="glyphicon glyphicon-zoom-in panel-icons"></span>
<span class="glyphicon glyphicon-trash panel-icons"></span>
</h3>
</div>
<div class="panel-body">
World
</div>
</div>
<div class="panel panel-default" draggable="true">
<div class="panel-heading">
<h3 class="panel-title">
Panel title
<span class="glyphicon glyphicon-pencil panel-icons"></span>
<span class="glyphicon glyphicon-zoom-in panel-icons"></span>
<span class="glyphicon glyphicon-trash panel-icons"></span>
</h3>
</div>
<div class="panel-body">
Hello
</div>
</div>
</div>
<div class="col-md-4 column" id="col2">
</div>
<div class="col-md-4 column" id="col3">