获取元素ID
这个问题在这里已经有了答案：
var id = $('li[data-id="KnSubject[StId]"]').attr('id');
console.log(id);
使用attr函数。
var elem = $('li[data-id="KnSubject[StId]"]');
console.log(elem.attr('id'));<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li role="treeitem" data-jstree="{"icon" : "glyphicon glyphicon-pencil"}" data-id="KnSubject[StId]" data-values="null" aria-selected="true" aria-level="3" aria-labelledby="j1_4_anchor" id="j1_4" class="jstree-node jstree-leaf"><i class="jstree-icon jstree-ocl" role="presentation"></i><a class="jstree-anchor jstree-clicked" href="#" tabindex="-1" id="j1_4_anchor"><i class="jstree-icon jstree-themeicon glyphicon glyphicon-pencil jstree-themeicon-custom" role="presentation"></i>Type dossieritem (StId)</a></li>仅出于完整性原因：
$('li[data-id="KnSubject[StId]"]').get(0).id
.get（0）检索原始JS DOM元素。
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