手机获取验证码

<span class="obtain-code">获取验证码</span>

js：
//获取验证码
$(".obtain-code").click(function() {
$(this).css('color', '#757575');
settime(this);
});
var countdown = 60;
function settime(obj) {
if(countdown == 0) {
obj.removeAttribute("disabled");
obj.innerHTML = "重新获取验证码";
$('.obtain-code').css('color', '#14C58E');
countdown = 60;
return;
} else {
obj.setAttribute("disabled", true);
obj.innerHTML = "" + countdown + "秒";
countdown--;
}
setTimeout(function() {
settime(obj);
}, 1000)
}