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用JavaScript生成随机验证码

2007-10-22 16:54 225 查看

说明:复制以下代码,即可生成效果.

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="divCode" style="background-color:White; width:52px; height:16px; padding:5px; text-align:center; vertical-align:middle; letter-spacing:5px; border:solid 1px blue"><span></span><span ></span><span ></span><span ></span></div>
</div>
<input id="Button1" type="button" value="换一张" onclick="JavaScript:validteCode()"/>
</form>
</body>
</html>
<script language="JavaScript" type="text/JavaScript">
function validteCode()
{
var codes = new Array(4); //用于存储随机验证码
var colors = new Array("Red","Green","Gray","Blue","Maroon","Aqua","Fuchsia","Lime","Olive","Silver");
for(var i=0;i < codes.length;i++)
{//获取随机验证码
codes[i] = Math.floor(Math.random()*10);
}
var spans = document.getElementById("divCode").all;
for(var i=0;i<spans.length;i++)
{
spans[i].innerHTML=codes[i];
spans[i].style.color = colors[Math.floor(Math.random()*10)]; //随机设置验证码颜色

}

}
document.onload = validteCode();
</script>

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