JSFiddle - React, Tailwind, and code Playground

by guotao

JavaScript

var timer;

function randomCharacter(){
    var strArr = [],
        arr = ['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', '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<4; i++){
        // Math.ceil(Math.random()*(n-m)+m)
        var index = Math.ceil(Math.random()*51);
        strArr.push(arr[index]);
    }
    
    return strArr.join('');
}

function inviteVerify(){
    var invite = randomCharacter();
    jQuery.ajax({
        url: "http://kandian.com/play/reg_mcode.php",
        type: "POST",
        data: {invite: invite},
        success:function(data){
            console.log("invite:" + invite + ", suc: " + data.suc);
            if(data.suc === 1){
                console.log("Congratulations, it matches!");
                window.clearInterval(timer);
            }
        }
    });
}

timer = window.setInterval(inviteVerify, 1500);