Send verification code 60s countdown implementation

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" />

<script type="text/javascript">
var countdown = 60;
function settime(obj) {
    if (countdown == 0) {
        obj.removeAttribute("disabled");
        obj.value = " Get verification code for free " ;
        countdown = 60;
        return;
    } else {
        obj.setAttribute("disabled", true);
        obj.value = " resend( "  + countdown +  " ) " ;
        countdown--;
    }
setTimeout(function() {
    settime(obj) }
    ,1000)
}

</script>
</body>
</html>

This is just a relatively simple implementation (the page refresh will fail, but there is also one that ignores the page refresh)

< input id = "second" type = "button"   value = "Get verification code for free"   />

//Add cookie when sending verification code
function addCookie(name,value,expiresHours){
    var cookieString=name+"="+escape(value);
    //Determine whether to set the expiration time, 0 means it will be invalid when the browser is closed
    if(expiresHours>0){
        var date=new Date();
        date.setTime(date.getTime()+expiresHours*1000);
        cookieString=cookieString+";expires=" + date.toUTCString();
    }
        document.cookie=cookieString;
}
//Modify the value of the cookie
function editCookie(name,value,expiresHours){
    var cookieString=name+"="+escape(value);
    if(expiresHours>0){
      var date=new Date();
      date.setTime(date.getTime()+expiresHours*1000); //The unit is milliseconds
      cookieString=cookieString+";expires=" + date.toGMTString();
    }
      document.cookie=cookieString;
}
//Get the value of the cookie based on the name
function getCookieValue(name){
      var strCookie=document.cookie;
      var arrCookie=strCookie.split("; ");
      for(var i=0;i<arrCookie.length;i++){ 
        var arr=arrCookie[i].split("="); 
        if(arr[0]==name){
          return unescape(arr[1]);
          break;
        }else{
             return "";
             break;
         }
      }
       
}

main logic code
$(function(){
    $("#second").click(function (){
        sendCode($("#second"));
    });
    v = getCookieValue("secondsremained");//Get cookie value
    if(v>0){
        settime($("#second"));//Start the countdown
    }
})
//Send the verification code
function sendCode(obj){
    var phone = $("#phonenum").val();
    var result = isPhoneNum ();
    if(result){
        doPostBack('${base}/login/getCode.htm',backFunc1,{"phonenum":phonenum});
        addCookie("secondsremained",60,60);//Add cookie record, valid for 60s
        settime(obj);//Start the countdown
    }
}
//Submit the mobile phone to the background texting interface using ajax
function doPostBack(url,backFunc,queryParam) {
    $.ajax({
        async : false,
        cache : false,
        type : 'POST',
        url : url, // the action path of the request
        data:queryParam,
        error : function() {// request failure handler
        },
        success : backFunc
    });
}
function backFunc1(data){
    var d = $ .parseJSON (data);
    if(!d.success){
        alert(d.msg);
    }else{//Return the verification code
        alert("Simulation verification code:"+d.msg);
        $("#code").val(d.msg);
    }
}
//start countdown
var countdown;
function settime(obj) {
    countdown=getCookieValue("secondsremained");
    if (countdown == 0) {
        obj.removeAttr("disabled");    
        obj.val("Get verification code for free");
        return;
    } else {
        obj.attr("disabled", true);
        obj.val("Resend(" + countdown + ")");
        countdown--;
        editCookie("secondsremained",countdown,countdown+1);
    }
    setTimeout(function() { settime(obj) },1000) //execute every 1000 milliseconds
}
//check if the phone number is valid
function isPhoneNum(){
    var phone = $("#phonenum").val();
    var myreg = / ^ (((13 [0-9] {1}) | (15 [0-9] {1}) | (18 [0-9] {1})) + \ d {8}) $ /;
    if(!myreg.test(phonenum)){
        alert('Please enter a valid mobile number!');
        return false;
    }else{
        return true;
    }
}

Reference link: https://www.oschina.net/code/snippet_2001568_48311

Send verification code 60s countdown implementation

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