【知了堂学习笔记】_JavaScript之DOM操作案例（验证码）

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刚刚学习了JS操作DOM，做了一个小小小小案例_验证码。

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <style type="text/css">
        div{
            width: 300px;
            margin: 100px auto;
        }
        .ipt{
            width: 150px;
            height: 30px;
        }
        #ma{
            width: 70px;
            height: 35px;
            font-size: 22px;
            text-align: center;
            line-height: 30px;
            display: inline-block;
            border: 1px solid #ccc;
            vertical-align: middle;

        }

        a{
            color: black;
            text-decoration: none;
        }
    </style>
    <body>
        <input type="text" placeholder="请输入图片中的验证码" class="ipt" onMouseOut="inputCode(this)" />
        <a href="###" onclick="createCode()" class="huan"><span id="ma"></span>&nbsp;换一张</a>
        <span class="pan" id="pan"></span>
    </body>

    <script>
        window.onload = function(){
            var code ;
            createCode();
        }

        function createCode(){
             code = "";// 创建4个数字验证码
            var codeLength = 4; // 验证长度4
            var checkCode = document.getElementById("ma");
            var arraycode = new Array(0,1,2,3,4,5,6,7,8,9,
            'a','b','c','d','e','f','g','h','i','j','k','m','l','n','o','p','q','r','s','t','o','v','w','x','y','z',
            'A','B','C','D','E','F','G','H','I','J','K','M','L','N','O','P','Q','R','S','T','O','V','W','X','Y','Z')    

            for(var i = 0;i<codeLength;i++){
                var randomCode = Math.floor(Math.random()*52);
                code += arraycode[randomCode];
            }

            if(checkCode){
                checkCode.innerHTML = code;
            }
        }

        function inputCode(obj){
            var pan = document.getElementById("pan");
            var inputValues = obj.value;
            console.log(inputValues)
            if(inputValues.length<0){
                pan.innerText = "is not null";
                pan.style.color = "red";
            }else if(inputValues.toUpperCase() != code.toUpperCase()){
               pan.innerText = "is error";
               pan.style.color = "red";

            }else{
                pan.innerText = "is right";
                pan.style.color = "green";
            }
        }
    </script>
</html>