JavaScript生成簡單數字驗證碼

時間 2019-12-10

標籤 javascript 生成簡單數字驗證碼欄目 JavaScript 简体版

原文原文鏈接

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Title</title>
</head>
<body>
<p class="code"></p>
<button>生成驗證碼</button>

<script>
    //驗證碼函數
    function createCode(length) {//驗證碼長度
        var code = "";
        for (var i = 1; i <= length; i++) {
            code += (parseInt(Math.random() * 10));
        }

        return code;
    }

    //輸出函數
    function deal() {
        document.getElementsByClassName("code")[0].innerText = "生成的驗證碼:" + createCode(4);
    }

    //事件處理
    document.getElementsByTagName("button")[0].onclick = deal;
</script>
</body>
</html>

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