今天閑著無聊，寫了個彈幕APP，主要實現以下幾個功能：

1.點擊“彈幕發射”或回車可以輸出彈幕到彈幕墻上。

2.彈幕的運行軌跡是從彈幕墻的最右邊到最左邊，Y軸的數值在彈幕墻的高度內隨機，顏色HEX隨機，速度隨機。

3.右側的表格可以儲存彈幕內容以及彈幕的發射時間，越靠近現在的越靠前。

4.點擊“清除彈幕”可以把彈幕墻內的所有彈幕清除掉，但不會影響到表格中的數據。

5.如果彈幕長度過長（我設置的是6個字符），則超過規定長度之外的彈幕內容都會由“...”代替，并放入表格中。但彈幕墻中的內容依然是完整的。

HTML代碼：

<div class="frame">  <div class="row">    <div class="col-xs-8 col-sm-8 col-md-8 col-lg-8 danmu-box-frame">      <div class="danmu-box">      </div>    </div>    <div class="col-xs-4 col-sm-4 col-md-4 col-lg-4 danmu-table-frame">      <table class="table .table-condensed danmu-table">        <thead>          <tr>            <th>              彈幕內容            </th>            <th>              彈幕時間            </th>          </tr>        </thead>        <tbody>        </tbody>      </table>    </div>  </div>  <div class="danmu-form">    <form class="form-inline">      <input type="text" class="form-control" placeholder="開始吐槽！">      <button type="button" class="btn btn-PRimary shoot">        發射彈幕！      </button>      <button type="button" class="btn btn-danger clear">        清空彈幕      </button>    </form>  </div></div><hr><footer>  Designed By  <a href="http://blog.csdn.net/alenhhy" target="_blank">    Alen Hu  </a></footer>*使用了Bootstrap3框架。
JQuery部分：
$(document).ready(function() {  $(".shoot").on("click", startDanmu);  $("form").keypress(function(event) {    if (event.keyCode === 13) {      event.preventDefault();      startDanmu();    }  });  $(".clear").on("click", clearDanmu);});//get random number in certain rangefunction RandomNum(Min, Max) {  var Range = Max - Min;  var Rand = Math.random();  var num = Min + Math.round(Rand * Range);  return num;}//time number add 0 before if <10function plusZero(x) {  if (x < 10) {    x = "0" + x;  } else {    x = x;  }  return x;}//start danmufunction startDanmu() {  var message = $("input");  var messageVal = message.val();  var danmuMessage = "<span class='danmu-message'>" + messageVal + "</span>";  //get random color HEX  //u can also save the colors u want by array  var color = RandomNum(100000, 999999);  //get random danmu speed  var speed = RandomNum(10000, 20000);  //get random position Y  //danmu box height is 450, we set the danmu position Y max 400 in case it blocks the subtitle  var positionY = RandomNum(50, 400);  if (messageVal.length > 0) {    //insert danmu message into danmu box    $(".danmu-box").prepend(danmuMessage);    //have to use first() cuz we prepend the message, u can try what's gonna happen if no first()    //set it's style    $(".danmu-message").first().CSS({      "right": "0",      "top": positionY,      "color": "#" + color    });    //set it's animation    //from right 0 to left 0    //hide it after move    $(".danmu-message").first().animate({      left: '0px',    },    speed,    function() {      $(this).fadeOut();    });    //get danmu time    var time = new Date();    var month = time.getMonth() + 1;    var day = time.getDay();    var hour = time.getHours();    var minute = time.getMinutes();    var danmuTime = plusZero(month) + "-" + plusZero(day) + " " + plusZero(hour) + ":" + plusZero(minute);    //insert danmu message to table    if (messageVal.length > 6) {      messageVal = messageVal.substring(0, 6) + "...";    }    var messageToTable = "<tr><td>" + messageVal + "</td><td>" + danmuTime + "</td></tr>";    $(".danmu-table > tbody").prepend(messageToTable);  } else {}  //empty the input  message.val("");}//clear danmu boxfunction clearDanmu() {  $(".danmu-box").html("");}
DEMO在這兒，歡迎來FORK：Danmu APP。