javascript - 改变事件目标

Question

我有以下html：

<div id="div1">
    <div id="div2">
    </div>
</div>

JS：

document.addEventListener('mousedown', function(e){
    console.log(e.target);
});

如果在 div2 上单击鼠标，则 e.target 为 div2。在这种情况下，我希望目标是 div1。是否可以？

Answer 1

最简单的方法可能是沿着 DOM 树向上走，直到找到所需的元素。

document.addEventListener('mousedown', function(e) {

    // start with the element that was clicked.
    var parent = e.target;

    // loop while a parent exists, and it's not yet what we are looking for.
    while (parent && parent.id !== 'div1') {

        // We didn't find anything yet, so snag the next parent.
        parent = parent.parentElement;
    }

    // When the loop exits, we either found the element we want,
    // or we ran out of parents.
    console.log(parent);
});​

示例：http: //jsfiddle.net/7kYJn/

Answer 2

在 DOM 中，您可以指定将事件侦听器附加到哪个元素：

var div1 = document.getElementById('div1');
div1.addEventListener('mousedown',function(e){
   console.log(e.target);
});