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<input type="text" name=‘‘ id="btn">
//发送验证码倒计时
var wait=30;
function time(o) {
if (wait == 0) {
o.removeAttribute("disabled");
o.value="免费获取验证码";
wait = 30;
}else{
o.setAttribute("disabled", true);
o.value="重新发送(" + wait + ")";
wait--;
setTimeout(function() {time(o) },1000)
}
}
document.getElementById("btn").onclick=function(){time(this);}
//调用倒计时JS
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原文地址:http://www.cnblogs.com/richerdyoung/p/4931472.html