Native js implementation of verification code generation method (complete code)-JS Tutorial-php.cn

Native js implementation of verification code generation method (complete code)

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Release： 2018-08-23 14:10:45

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The content of this article is about the generation method of native js implementation verification code (complete code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .block{
            width: 150px;
            height: 50px;
            line-height: 50px;
            border: 1px solid silver;
            background:url("./img/bg1.png")no-repeat;
            background-size:120% ;
            text-align: center;
        }
        .btn{
            color: green;
            background-color: #d6ffe1;
            cursor: pointer;
        }
        .yztxt{
            width: 150px;
            height: 20px;
            border: 1px solid silver;
        }
    </style>
</head>
<body>
<p class="block"></p>
<span class="btn">看不清....</span><br>
<input class="yztxt" type="text"><br>
<button class="yz">验证</button>
<script>
    var b=document.getElementsByClassName("block")[0];
    var btn=document.getElementsByClassName("btn")[0];
    var s=document.getElementsByClassName("txt");
    var yztxt=document.getElementsByClassName("yztxt")[0];
    var yz=document.getElementsByClassName("yz")[0];
    var numrous=""; //定义一个空数组 用来存放生成的验证码
    yz.onclick=function(){  //给验证按钮一个方法 判断验证码是否输入正确
        if(yztxt.value.length<=0){
            alert("请输入验证码：")
        }
         else if(yztxt.value== numrous.toLowerCase()){
            alert("验证成功！");
        }
        else{
            alert("验证失败！");
            nrandom();//验证失败重新调随机产生验证码的函数
        }
    };

    btn.onclick=function(){//当鼠标点击看不清时，切换验证码
        nrandom();
    };
    nrandom();
    function nrandom(){
        numrous="";//在产生下一组验证码，清空上次验证码
        b.innerHTML="";//清空文本框中验证码
        for(var i=0;i<6;i++){
             var num=Math.random()*100; //产生数字，大小写字母的总概率100
            if(num<=50){
                //数字产生的概率50%
                var n=Math.floor(Math.random()*10);
                numrous+=n;//将随机产生的数字放在字符串numrous
                b.innerHTML+="<span class=&#39;txt&#39;>"+n+"</span>";//将随机产生的数字在文本框中显示
            }
            else if(num>=50&&num<=80){
                //产生小写字母的概率为30%
                var n =String.fromCharCode(Math.floor(Math.random()*25+97));
                numrous+=n;
                b.innerHTML+="<span class=&#39;txt&#39;>"+n+"</span>";
            }
            else{
                //产生大写字母的概率20%
                var n =String.fromCharCode(Math.floor(Math.random()*25+65));
                numrous+=n;
                b.innerHTML+="<span class=&#39;txt&#39;>"+n+"</span>";
            }
        }
        stylezi();//调用验证码字体样式
    }
    //下面分别设置了验证码的颜色，大小，粗细，距左的距离以及倾斜角度
   function stylezi(){
        for(var i=0;i< s.length;i++){
            s[i].style.color="rgb("+Math.floor(Math.random()*255)+","+Math.floor(Math.random()*255)+","+Math.floor(Math.random()*255)+")";
            s[i].style.fontSize=(Math.random()*20+15)+"px";
            s[i].style.fontWeight=Math.random()*300+200;
            s[i].style.left=(Math.random()*20-10)+"px";
            s[i].style.transform="rotatez("+Math.random()*90-45+"deg)";
        }
    }
</script>
</body>
</html>

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