DOM events targetand currentTargetthe difference
targetIt is an event-triggered real elementcurrentTargetIs the event binding elementEvent handler in
thispoint is forcurrentTargetcurrentTargetAndtarget, sometimes one and the same element, and sometimes not the same element (because the event bubbling)- When an event is triggered child element,
currentTargetthe element binding events,targetas child elements - When the event is triggered when the element itself,
currentTargetandtargetfor the same element.
- When an event is triggered child element,
<body>
<ul id="box">
<Li id="apple">苹果</Li>
<li>香蕉</li>
<li>桃子</li>
</ul>
</body>
<script type="text/javascript">
var box = document.getElementById('box');
var apple = document.getElementById('apple');
//直接绑定在目标元素apple上
apple.onclick = function (e){
console.log(e.target); //<li id="apple">苹果</li>
console.log(e.currentTarget); //<li id="apple">苹果</li>
console.log(this); //<li id="apple">苹果</li>
console.log(e.target === e.currentTarget); //true
console.log(e.target === this); //true
}
//绑定在父元素box上（如果点击apple这个li时）
box.onclick = function (e){
console.log(e.target); // <li id="apple">苹果</li>
console.log(e.currentTarget); //<ul id="box">...</ul>
console.log(this); //<ul id="box">...</ul>
console.log(e.currentTarget===this); //true
console.log(e.target === e.currentTarget); //false
console.log(e.target === this); //false
}
</script>