js页面输入验证码怎么进行校验

JavaScript04

js页面输入验证码怎么进行校验,第1张

<html>

<head>

<script language="javascript" type="text/javascript">

var code

function createCode(){

code = new Array()

var codeLength = 4

var checkCode = document.getElementById("checkCode")

checkCode.value = ""

var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z')

for(var i=0i<codeLengthi++) {

var charIndex = Math.floor(Math.random()*32)

code +=selectChar[charIndex]

}

checkCode.value = code

}

function validate () {

var inputCode = document.getElementById("yzm").value.toUpperCase()

if(inputCode != code ){

alert("验证码错误！")

return false

}

else {

alert("验证码正确！")

return true

}

}

</script>

<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312">

</head>

<body onLoad="createCode()">

验证码：<input type="text" id="yzm" size="5" />

<input type="button" id="checkCode" onClick="createCode()" title="刷新验证码" style="width:50pxcolor:#F00border:0letter-spacing:1pxfont-family:Arial" />

<input type="button" id="Button1" onClick="validate()" value="确定" />

</body>

</html>

private string code = ""

建议写成 public

然后在前台页面js中用 var code='<% =code %>'

获取值，然后跟你输入的文本框中的值进行对比