js依存mui.css生成ピクチャ検証コード

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js依存mui.css生成ピクチャ検証コード


関連cssとjs導入経路


https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.css
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.min.css
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/fonts/mui.ttf
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.js
https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.min.js
 
DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <meta http-equiv="Pragma" content="no-cache" />
    <meta http-equiv="Expires" content="0" />
    <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <title>js  mui.css       title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/css/mui.min.css" />
    <style>
        #verifital_input {
            border:1px solid black;
        }
        /*   */
        .verificationCode{
            width: 4rem;
            height: 100%;
            position: absolute;
            right: 0;
        }
        canvas{
            width: 100%;
            height: 100%;
        }
        #code_img {
            width: 100%;
            height: 100%;
            cursor: pointer;
            vertical-align: top;
        }
    style>
head>
<body>
    <div class="mui-content">
        <div class="mui-input-row login_input" style="width:300px;">
            <label>   label>
            <input type="text" id="verifital_input" class="mui-input" placeholder="      ">
            <div id="verificationCode" class="verificationCode">
                <canvas width="100" height="40" id="verifyCanvas">canvas>
                <img id="code_img">
            div>
        div>
    div>
body>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mui/3.7.1/js/mui.min.js" >script>
<script src="https://lib.baomitu.com/jquery/3.4.1/jquery.js">script>
<script>
var nums = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0", 
'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'];
//       
var str = '';
//       
var verVal = drawCode();
//      
function drawCode () {
    var canvas = document.getElementById("verifyCanvas"); //  HTML   
    var context = canvas.getContext("2d"); //    2D   
    context.fillStyle = "cornflowerblue"; //     
    context.fillRect(0, 0, canvas.width, canvas.height); //    
    context.fillStyle = "white"; //      
    context.font = "25px Arial"; //    
    var rand = new Array();
    var x = new Array();
    var y = new Array();
    //       
    for (var i = 0; i < 4; i++) {
        rand.push(rand[i]);
        rand[i] = nums[Math.floor(Math.random() * nums.length)]
        x[i] = i * 20 + 10;
        y[i] = Math.random() * 20 + 20;
        context.fillText(rand[i], x[i], y[i]);
    }
    //             str
    str = rand.join('').toUpperCase();
    // 3    
    for (var i = 0; i < 3; i++) {
        drawline(canvas, context);
    }
    //  30    
    for (var i = 0; i < 30; i++) {
        drawDot(canvas, context);
    }
    //    
    convertCanvasToImage(canvas);
}
//    
function drawline (canvas, context) {
    context.moveTo(Math.floor(Math.random() * canvas.width), Math.floor(Math.random() * canvas.height)); //      x     x  0  ,y           
    context.lineTo(Math.floor(Math.random() * canvas.width), Math.floor(Math.random() * canvas.height)); //      x       ,y           
    context.lineWidth = 0.5; //    
    context.strokeStyle = 'rgba(50,50,50,0.3)'; //       
    context.stroke(); //
}
//    (         1px    ,      )
function drawDot (canvas, context) {
    var px = Math.floor(Math.random() * canvas.width);
    var py = Math.floor(Math.random() * canvas.height);
    context.moveTo(px, py);
    context.lineTo(px + 1, py + 1);
    context.lineWidth = 0.2;
    context.stroke();
}
//     
function convertCanvasToImage (canvas) {
    document.getElementById("verifyCanvas").style.display = "none";
    var image = document.getElementById("code_img");
    image.src = canvas.toDataURL("image/png");
    return image;
}

//       
document.getElementById('code_img').onclick = function() {
    resetCode();
}
//     
function resetCode () {
    $('#verifyCanvas').remove();
    $('#code_img').before('')
    //       
    verVal = drawCode();
}
document.getElementById("verifital_input").addEventListener("change",validate);
//    
function validate(){
    var inputCode = document.getElementById("verifital_input").value.toUpperCase(); //              
    if(inputCode.length <= 0) { //          0
    alert(""); //         
    $("#verifital_input").focus();
    } else if(inputCode != str ) { //                  
        alert("       !@_@"); //          
        resetCode();//     
        $("#verifital_input").val("");//     
        $("#verifital_input").focus();//        
    } else { //     
        $("#verifyCanvas").blur();//              
        alert(""); 
    }
};
script>
html>