$(function(){
  $('img').load(function(){
    var box = $('.box');
    var boxHeight = {
      leftBox:[],
      centerBox:[],
      rightBox:[]
    }
    for(var i=0;i<box.length;i++){
      var now = i%3;   //now的值為0，1，2
      switch(now){
        case 0:
          box.eq(i).css('left','10px');
          boxHeight.leftBox.push(box.eq(i).height());
          var now2 = Math.floor(i/3);
          if(now2==0){
            box.eq(i).css('top',0);
          }else{
            var total = 0;
            for(var j=0;j<now2;j++){
              total += boxHeight.leftBox[j]+10;
            }
            box.eq(i).css('top',total+'px')
          }
        break;
        case 1:
          box.eq(i).css('left','270px');
          boxHeight.centerBox.push(box.eq(i).height());
          var now2 = Math.floor(i/3);
          if(now2==0){
            box.eq(i).css('top',0);
          }else{
            var total = 0;
            for(var j=0;j<now2;j++){
              total += boxHeight.centerBox[j]+10;
            }
            box.eq(i).css('top',total+'px')
          }
        break;
        case 2:
          box.eq(i).css('left','530px');
          boxHeight.rightBox.push(box.eq(i).height());
          var now2 = Math.floor(i/3);
          if(now2==0){
            box.eq(i).css('top',0);
          }else{
            var total = 0;
            for(var j=0;j<now2;j++){
              total += boxHeight.rightBox[j]+10;
            }
            box.eq(i).css('top',total+'px')
          }
        break;
      }
    }
  });
});

demo.html：

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>waterFall</title>
<style>
*{
  padding: 0;
  margin: 0;
}
.wrap{
  position: relative;
}
.box{
  position: absolute;
  left: 0;
  top: 0;
  width: 250px;
}
.box img{
  width: 250px;
}
</style>
<script src="jquery.js"></script>
<script src="demo.js"></script>
</head>
<body>
<div class="wrap">
  <div class="box">
    <img src="1.jpg" alt="">
    <p>1111111</p>
  </div>
  <div class="box">
    <img src="2.jpg" alt="">
    <p>22222222</p>
  </div>
  <div class="box">
    <img src="3.jpg" alt="">
    <p>33333333</p>
  </div>
  <div class="box">
    <img src="4.jpg" alt="">
    <p>4444444</p>
  </div>
  <div class="box">
    <img src="5.jpg" alt="">
    <p>55555555</p>
  </div>
  <div class="box">
    <img src="6.jpg" alt="">
    <p>666666666666</p>
  </div>
  <div class="box">
    <img src="7.jpg" alt="">
    <p>77777777</p>
  </div>
  <div class="box">
    <img src="8.jpg" alt="">
    <p>888888888888888</p>
  </div>
  <div class="box">
    <img src="9.jpg" alt="">
    <p>99999999999999</p>
  </div>
</div>
</body>
</html>

效果圖如下：