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簡單實現jQuery彈幕效果，jquery彈幕
在要寫一個彈幕案例的時候，首先要清楚每一步要幹什麼。
首先搭好架構之後在要發送彈幕時應該準備進行如下步驟：
裡面還有許多細節，仔細看就會有收穫！
<!DOCTYPE html><html><head><meta charset = "utf-8" /> <title>彈幕案例</title> <script src = "http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script> <script> $(function(){ var boxDom = $("#boxDom"); //var domContent = $("#domContent"); var top, right; var pageWidth = parseInt($(document).width()); var pageHeight =parseInt($(document).height()); //點擊按鈕 $("#btn").bind("click",auto);//按鈕Binder 方法 //按下斷行符號 document.onkeydown = function(){ if(event.keyCode == 13){ auto(); } } function auto(){ //1.擷取輸入的字串 var str = $(".text").val(); //2.產生一個元素 var createSpan = $("<span class = 'string' ></span>"); //3.給產生的元素賦值 createSpan.text(str); //為了頁面友好，清空剛剛輸入的值 $(".text").val(""); //產生元素一個隨機的位置，為了使每條彈幕都出現在螢幕上不同的位置 top = Math.floor(Math.random()*pageHeight); createSpan.css({"top":top, "right": -400, "color": getRandomColor()}); boxDom.append(createSpan); //4.設定元素的動畫效果，animate(css樣式值，時間， 執行完動畫調用的方法) //頁面上有N個span，只讓最後一個動起來 var spandom = $("#boxDom>span:last-child");//找到最後一個span spandom.animate({"right":pageWidth+300},10000,function(){ //移除元素 $(this).remove(); }); } //定義一個可以產生隨機顏色的方法,可以使每條彈幕的顏色不同 function getRandomColor(){ var colorArr = ['1','2','3','4','5','6','7','8','9','A','B','C','D','E','F']; var color = ""; for(var i = 0; i < 6; i++){ color += colorArr[Math.floor(Math.random()*16)]; } return "#"+color; } }); </script> <style type="text/css"> html,body{ margin: 0px; padding: 0px; width: 100%; height: 100%; font-family: "微軟雅黑"; background: #ccc; } .boxDom{ width: 100%; height: 100%; position: relative; overflow: hidden; } .idDom{ width: 100%; height: 60px; background:#666; position: fixed; bottom: 0px; } .contet{ width: 500px; height: 40px; position: absolute; top: 0px; right: 0px; bottom: 0px; left: 0px; margin: auto; } .title{ display: inline; font-size: 24px; vertical-align: bottom; color: #ffffff; padding-left: 300px; } .text{ width: 300px; height: 30px; border:none; border-radius:5px; font-size: 20px; margin-left:60px; } .btn{ width: 60px; height: 30px; color: #ffffff; background-color: red; border:none; font-size:16px; margin-left:60px; margin-top: 20px; } .string { width: 300px; height: 40px; margin-top: 20px; position: absolute; color: #000; font-size: 20px; font-family: "微軟雅黑"; } </style></head><body><div class = "boxDom" id = "boxDom"> <img src="../images/bg_2.jpg" style="width:100%; height:100%" /> <div id = "idDom" class = "idDom"> <div class = "content"> <p class = "title"> 說點什麼:</p> <input type = "text" class = "text"/> <button type = "button" class = "btn" id = "btn" >發送</button> </div> </div></div></body></html>
如下：
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