JS点击图片后显示验证码 如何实现？

JavaScript08

JS点击图片后显示验证码 如何实现？,第1张

最简单的方法你把图一的显示验证码也弄成一个图片，比如叫code.png，上面你的代码就能换成

<img src="code.png" onclick="this.src ={$maccms.path_tpl}picture/captcha.png"

var a='233*232'

var b=a.match(/(\d+)/)

if(b[0]>400&&b[1]>200){alert('宽度不能大于400高度不能大于200')}

<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>