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var code ; //在全局定义验证码
function createCode(){
code = "" ;
var codeLength = 4; //验证码的长度
var checkCode = document.getElementById( "code" );
var random = new Array(0,1,2,3,4,5,6,7,8,9, ‘A‘ , ‘B‘ , ‘C‘ , ‘D‘ , ‘E‘ , ‘F‘ , ‘G‘ ,
‘H‘ , ‘I‘ , ‘J‘ , ‘K‘ , ‘L‘ , ‘M‘ , ‘N‘ , ‘O‘ , ‘P‘ , ‘Q‘ , ‘R‘ , ‘S‘ , ‘T‘ , ‘U‘ , ‘V‘ , ‘W‘ , ‘X‘ , ‘Y‘ ,
‘Z‘ ); //随机数
for ( var i = 0; i < codeLength; i++) { //循环操作
var index = Math.floor(Math.random()*36); //取得随机数的索引(0~35)
code += random[index]; //根据索引取得随机数加到code上
}
checkCode.value = code; //把code值赋给验证码
}
//校验验证码
function validate(){
var inputCode = document.getElementById( "input" ).value.toUpperCase();
//取得输入的验证码并转化为大写
if (inputCode.length <= 0) { //若输入的验证码长度为0
alert( "请输入验证码!" ); //则弹出请输入验证码
} else if (inputCode != code ) { //若输入的验证码与产生的验证码不一致时
alert( "验证码输入错误!" ); //则弹出验证码输入错误
createCode(); //刷新验证码
document.getElementById( "input" ).value = "" ; //清空文本框
} else { //输入正确时
alert( "验证通过" );
}
}
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