你会做一个js获取验证码吗？

怼烎@ 2021-09-19 15:24 311阅读 0赞

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>验证码</title>
        <style>
        .get{
            cursor: pointer;
        }
        .reset{
            display: none;
        }
        .reset span{
            color:red;
        }
        </style>
    </head>
    <body>
        <input type="text"><button>确定</button>
        <p class="get">获取验证码</p>
        <p class="reset">重新获取验证码<span>10</span>s</p>
    </body>
    <script>
    function $(el) {
        return document.querySelector(el);
    }
    let val="";
    let timer=null;
    function stop() {
        clearInterval(timer);
        timer=null;
    }
    $(".get").onclick=function(){
        this.style.display="none";
        $(".reset").style.display="block";
        var chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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'];
        function generateMixed(n) {
        var res = "";
        for(var i = 0; i < n; i++) {
           var id=Math.ceil(Math.random() * 35); 
           res +=chars[id]; 
           } 
           return res;
        } 
        var num1=generateMixed(4); 
        val=num1;
        alert(num1);
        var i=10;
        timer=setInterval(() => {
            i--;
            $(".reset span").innerText=i;
            if(i===0){
                stop();
                $(".reset").style.display="none";
                $(".get").style.display="block";
            }
        }, 1000);
    }
    $("button").onclick=function(){
        console.log(val);
        if(val!=$("input").value){
            console.log("输入错误");
            $("input").value="";
            return;
        }
    }
    </script>
    </html>