js中在非use strict下怎么证明eval会造成内存泄露?

Z时代
2024-02-27
分类：IT

问题

js中在非use strict下使用eval会造成内存泄露吗？
怎么证明eval会造成内存泄露

代码及演示

下面的代码会点击evalClosures被回收掉

代码出处链接


<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
<p>
<button onclick="largeClosures()">largeClosures</button></p>
<p><button onclick="smallClosures()">smallClosures</button></p>
<p><button onclick="evalClosures()">evalClosures</button></p>
<p><button onclick="clearClosures()">clearClosures</button></p>
<script >
var closures = [];
function createLargeClosure() {
    var largeStr = new Array(1000000).join('x');
    return function lC() {
        return largeStr;
    };
}
function createSmallClosure() {
    var smallStr = 'x';
    var largeStr = new Array(1000000).join('x');
    return function sC() {
        return smallStr;
    };
}
function createEvalClosure() {
    var smallStr = 'x';
    var largeStr = new Array(1000000).join('x');
    return function eC() {
        eval('');
        return smallStr;
    };
}
function largeClosures() {
    closures.push(createLargeClosure());
}
function smallClosures() {
    closures.push(createSmallClosure());
}
function evalClosures() {
    closures.push(createEvalClosure());
}
function clearClosures() {
    closures = []
}
</script>
</body></html>