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The difference between target and this of event objects in Javascript
- autoloadOriginal
- 2021-04-09 10:25:511805browse
When learning event objects, I always think that target and this are the same. It was not until later that I discovered that the difference between the two is quite big. Today I will take you through Get up and take a look.
1. When the trigger object is consistent with the binding object
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<ul class="list">
<li class="itm">item1</li>
<li class="itm">item2</li>
<li class="itm">item3</li>
<li class="itm">item4</li>
<li class="itm">item5</li>
</ul>
<script>
const li=document.querySelector("ul li:nth-of-type(4)");
console.log(li);
li.addEventListener("click",function(e){
console.log(e.target);
console.log(this);
});
</script>
</body>
</html> Click on item4this## After #li, both return as follows:
2. When the trigger object is inconsistent with the binding object
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<ul class="list">
<li class="itm">item1</li>
<li class="itm">item2</li>
<li class="itm">item3</li>
<li class="itm">item4</li>
<li class="itm">item5</li>
</ul>
<script>
const ul=document.querySelector("ul");
console.log(ul);
ul.addEventListener("click",function(e){
console.log(e.target);
console.log(this);
});
</script>
</body>
</html> After clicking item4 thisli, the output is as follows:
3. Summary:
target
returns the event trigger objectthis
returns the event binding object
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