html代码

    
<input type="button"  onclick="get_mobile_code()" id="code" value="&nbsp;获取验手机证码&nbsp;"  />

js代码

    
//获取验证码罗辑
functionget_mobile_code() { 
    //ajax获取验证码罗辑，获取成功开始倒计时
    set_time();
}
//倒计时  
var countdown=60;  
function set_time() { 
    var val = document.getElementById('#code'); 
    if (countdown == 0) {  
        val.removeAttribute("disabled");  
        val.value=" 获取验手机证码 ";  
        countdown = 60;  
        return false;  
    } else {  
        val.setAttribute("disabled", true);  
        val.value=" " +countdown + "秒后可重新发送 ";  
        countdown--;  
    }  
    setTimeout(function() {  
        set_time(val);  
    },1000);  
}

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