function sendCheckNumber(){
//每次点击产生验证码
var codeLength = 4;//验证码长度为4
//设置随机字符
currentCheckNumber="";//初始化验证码字符串
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');
for(var i = 0; i < codeLength; i++){
var index = Math.floor(Math.random()*36);//设置随机数范围
currentCheckNumber += random[index]; //字符串拼接 将每次随机的字符 进行拼接
}
$('#tip4').html(""); //删除之前的验证码
$('#tip4').html(currentCheckNumber);//一个div显示验证码并更新
}
JavaScript制作简单的随机数验证码
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转载自blog.csdn.net/CWH0908/article/details/85225764
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