javascript之DOM四位的验证码简单实现

时间：2022-10-20 06:40:41
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<script type="text/javascript">

    //产生一个四位的验证码。

    function createCode(){

        var datas = ['A','B','何','敏','凡','江','1','9']; // 0-7  长度8

        var code = "";

        for(var i = 0 ; i<4; i++){

            //随机产生四个索引值

            var index =  Math.floor(Math.random()*datas.length); // random 0.0-1.0（不包括1.0）

            code+=datas[index];

        }    

        var spanNode = document.getElementById("code");

        spanNode.innerHTML = code;

        spanNode.style.fontSize ="24px";

        spanNode.style.color = "red";

        spanNode.style.backgroundColor="gray";

        spanNode.style.textDecoration = "line-through";

    }

function ready(){

    createCode();

}

</script>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

</head>

<body onload="ready()">

    <span id="code"></span><a href="#" onclick="createCode()">看不清，换一个</a>

</body>

</html>

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