弹幕效果

布局：

div.boxDom > div. idDom > content > p+input +button

jQuery代码：

var colors=["red" , "green" , "blue" , " pink" , " gray"];
var randomColor=parseInt(Math.random()*colors.length);
var randomY=parseInt(Math.random()*400);

$("#btn").click(function(){
  $("<span></span>")
       .appendTo("#boxDom")
      .text($("#text").val())
      .css("color", colors[randomColor])
      .css("left" , "1400px")
       .css("top" , randomY)
       .animate({left : -500} ,10000, " linear " , function() {
           $(this).remove();
       })

    $("#text").val("");
});

还可以补充回车键发送：

$("#text").keyup(function(e){
  if(e.keyCode==13){
      $("#btn").click();
  }
});

完整代码：

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title></title>
  <style type="text/css">
    html, body {
      margin: 0px;
      padding: 0px;
      width: 100%;
      height: 100%;
      font-family: "微软雅黑";
      font-size: 62.5%;
    }
    
    .boxDom {
      width: 100%;
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    
    .idDom {
      width: 100%;
      height: 100px;
      background: #666;
      position: fixed;
      bottom: 0px;
    }
    
    .content {
      display: inline-block;
      width: 430px;
      height: 40px;
      position: absolute;
      left: 0px;
      right: 0px;
      top: 0px;
      bottom: 0px;
      margin: auto;
    }
    
    .title {
      display: inline;
      font-size: 4em;
      vertical-align: bottom;
      color: #fff;
    }
    
    .text {
      border: none;
      width: 300px;
      height: 30px;
      border-radius: 5px;
      font-size: 2.4em;
    }
    
    .btn {
      width: 60px;
      height: 30px;
      background: #f90000;
      border: none;
      color: #fff;
      font-size: 2.4em;
    }
    
    span {
      width: 300px;
      height: 40px;
      position: absolute;
      overflow: hidden;
      color: #000;
      font-size: 4em;
      line-height: 1.5em;
      cursor: pointer;
      white-space: nowrap;
    }
  
  </style>
</head>

<body>

<div class="boxDom" id="boxDom">
  <div class="idDom" id="idDom">
    <div class="content">
      <p class="title">吐槽:</p>
      <input type="text" class="text" id="text"/>
      <button type="button" class="btn" id="btn">发射</button>
    </div>
  </div>
</div>
</body>

<script src="jquery-1.12.4.js"></script>
<script>
  
  $(function () {
    
    //注册事件
    var colors = ["red", "green", "hotpink", "pink", "cyan", "yellowgreen", "purple", "deepskyblue"];
    var randomColor = parseInt(Math.random() * colors.length);
    var randomY = parseInt(Math.random() * 400);
    $("#btn").click(function () {
      $("<span></span>")//创建span
        .appendTo("#boxDom")
        .text($("#text").val())//设置内容
        .css("color", colors[randomColor])//设置字体颜色
        .css("left", "1400px")//设置left值
        .css("top", randomY)//设置top值
        .animate({left: -500}, 10000, "linear", function () {
          //到了终点，需要删除
          $(this).remove();
        })

      
      
      $("#text").val("");
    });
    
    
    $("#text").keyup(function (e) {
      if (e.keyCode == 13) {
        $("#btn").click();
      }
    });
    
  });

</script>
</html>

 

posted @ 2019-09-15 20:04  shanlu  阅读(145)  评论(0)  编辑  收藏  举报