梦入琼楼寒有月，行过石树冻无烟

JavaScript for 循环

2022-04-21

循环5次（for……)

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<button onclick="myFunction()">开始</button>
<p id="data"></p>
<script>
    function myFunction() {
        var a = "";
        for (var i=0;i<10;i++) {
            a = a + "本次执行 " + i + "<br>";
        }
        document.getElementById('data').innerHTML = a;
    }
</script>
</body>
</html>

遍历对象 (for……in)

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<button onclick="myFunction()">开始</button>
<p id="data"></p>
<script>
    function myFunction() {
        var x;
        var two = "";
        var person = {one:"ones",
                    two:"twos",
                    three:"three"};
        for (x in person) {
            two = two + person[x];
        }
        document.getElementById('data').innerHTML = two;
    }
</script>
</body>
</html>
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