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JavaScript寫的隨機選人真實案例

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>java</title> <!-- 最新版本的 Bootstrap 核心 CSS 檔案 --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
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body { overflow: hidden; /*當內容溢位時,不顯示*/ /* background-image: url("image/流星雨.jpg"); */ } .divv { position: absolute; top: 50px; left: 42%; width: 268px; height: 600px; } #num { text-align: center; color: white; font-size: 40px; } .button { text-align: center; } #img { width: 268px; height: 271px; } #canvas { } </style> <body> <div class="divv"> <img class="img-thumbnail" alt="頭像" id="img" src="image/yuan.jpg"> <div id="num"></div> <div class="button"> <button id="start" class="btn btn-success">開始</button> <button id="stop" class="btn btn-info">結束</button> </div> </div> <!-- <canvas>畫布 畫板 畫畫的本子 --> <canvas width=400 height=400 style="background: #000000;" id="canvas"></canvas> <!-- javascript 畫筆 --> </body> <script type="text/javascript"> var num = document.getElementById("num"); var img = document.getElementById("img"); var start = document.getElementById("start"); var stop = document.getElementById("stop"); var image = [ "image/XX.jpg", "image/zXXn.jpg", "image/XX.jpg", "image/XX.jpg", "image/XX.jpg", "image/XX.jpg" ]; var arr = [ "曹XX", "趙XX", "XX", "李XX", "馬XX", "沈XX" ]; var intv = null; start.onclick = function() { if (intv == undefined) { intv = setInterval(function() { var random = Math.floor(Math.random() * 6); num.innerHTML = arr[random]; img.src = image[random]; }, 500); } } stop.onclick = function() { clearInterval(intv); intv = null; } /* 下面是流星雨程式碼 */ var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); var s = window.screen; var w = s.width; var h = s.height; canvas.width = w; canvas.height = h; var fontSize = 14; var clos = Math.floor(w / fontSize); var drops = []; var str = "qwertyuiopasdfghjklzxcvbnm"; for (var i = 0; i < clos; i++) { drops.push(0); } function drawString() { ctx.fillStyle = "rgba(0,0,0,0.05)" ctx.fillRect(0, 0, w, h); ctx.font = "600 " + fontSize + "px 微軟雅黑"; ctx.fillStyle = "#00ff00"; for (var i = 0; i < clos; i++) { var x = i * fontSize; var y = drops[i] * fontSize; ctx.fillText(str[Math.floor(Math.random() * str.length)], x, y); if (y > h && Math.random() > 0.99) { drops[i] = 0; } drops[i]++; } } setInterval(drawString, 30); </script> </html>