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A good example of a JS memory leak _javascript Tips

Source: Internet
Author: User
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I have changed the example of others, I think this is more compact to write! In other words, when a DOM object contains a reference to a JS object (for example, an event Handler), and this JS object holds a reference to this Dom object, a circular reference is made, and a memory leak occurs under IE. Click "Run Code" and open Task Manager to see memory changes. Separately in IE8 and FF under the test, the gap does not need to say more.

Run code

Copy Code code as follows:

<title>memory leak</title>
<style>
body{
padding:10px;
}
</style>
<body>
</body>
<script>
var q = [];
var n = 0;
SetInterval (function () {
Q.push (Makespan ());
if (q.length>=10) {
var s = q.shift ();
if (s) {
S.parentnode.removechild (s);
}
}
n++;
},10);

function Makespan () {
var s = document.createelement ("span");
Document.body.appendChild (s);
var T=document.createtextnode ("* * *" + n + "* * *");
S.appendchild (t);
S.onclick=function (e) {
S.style.backgroundcolor= "Red";
alert (n);
};
return s;
};
</script>

then in IE how to solve it?

When deleting a node, manually break the ring reference and change the SetInterval code slightly below:

Copy Code code as follows:

SetInterval (function () {
Q.push (Makespan ());
if (q.length>=10) {
var s = q.shift ();
if (s) {
S.onclick = null;//key is here
S.parentnode.removechild (s);
}
}
n++;
},10);

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