Example analysis of super simple like effect implemented by jQuery_jquery

The example in this article describes the super simple like effect implemented by jQuery. It is shared with everyone for your reference. The details are as follows:

1.HTML (can be optimized to have as few tags as possible...)

<div id="dianz">
  <b class="cz"><em>1</em><i></i><s></s><u>超赞</u></b>
  <b class="tj"><em>2</em><i></i><s></s><u>推荐</u></b>
  <b class="yb"><em>3</em><i></i><s></s><u>一般</u></b>
  <b class="wl"><em>6</em><i></i><s></s><u>无聊</u></b>
  <b class="lj"><em>5</em><i></i><s></s><u>雷囧</u></b>
</div>

2.css style

#dianz{text-align:center; width:610px; overflow:hidden;zoom:1; margin:20px auto;}
#dianz b{ display:inline-block; width:120px; height:215px; float:left; position:relative;}
#dianz b em,#dianz b u,#dianz b i,#dianz b s{display:inline-block; width:100%; height:20px; position:absolute; left:0px;}
#dianz b u{ bottom:0px;}
#dianz b s{ bottom:20px; height:95px;}
#dianz b i{width:20px; height:80px;left:50px; bottom:115px;}
#dianz b.cz s{ background:url(../images/dianz.jpg) 25px 0px no-repeat}
#dianz b.cz i{ background-color:#fe0032;}
#dianz b.tj s{ background:url(../images/dianz.jpg) -105px 0px no-repeat}
#dianz b.tj i{ background-color:#fe9903;}
#dianz b.yb s{ background:url(../images/dianz.jpg) -235px 0px no-repeat}
#dianz b.yb i{ background-color:#99c900;}
#dianz b.wl s{ background:url(../images/dianz.jpg) -370px 0px no-repeat}
#dianz b.wl i{ background-color:#32ccff;}
#dianz b.lj s{ background:url(../images/dianz.jpg) -500px 0px no-repeat}
#dianz b.lj i{ background-color:#3167ff;}

3.js (the use of js is not very good, everyone can optimize it better)

function o_dianz(){
  var oi=$('#dianz b i'); //获取i;
    oem=$('#dianz b em'); //获取em;
    os=$('#dianz b s');//获取s;
    bl=null;
    osz=null;
    Arr=[];
    Arr2=[];
 function o_mm(){
  oem.each(function(){
      osz=$(this).text();
      Arr.push(osz);
      //console.log(Arr)
     });
  var get_max=Math.max.apply(null,Arr); //获取最大点赞数；
  bl=80/get_max;
  oem.each(function(){
      osz=$(this).text();
      var oi_H=Math.floor(osz*bl);
      Arr2.push(oi_H);
     });
  for(var i=0; i<Arr2.length; i++){
      oi.eq(i).height(Arr2[i]);
      oem.eq(i).css('top',80-Arr2[i]);
    };
   };
   o_mm();
  os.click(function(){ //点赞增加；
      Arr=[];
      Arr2=[];
      osz=$(this).siblings('em').text();
      osz++;
      $(this).siblings('em').text(osz);
      o_mm();
    });
  };
o_dianz();

Okay, the code is posted, it’s super simple. The principle I wrote (I don’t know if there is a better one, and the bug has not been detected): Set the default height of the i tag to 80px, then find the text value of each em through js, throw it into the array Arr, and then pass This method Math.max.apply(null,Arr), finds the value of the maximum text, and then finds the scale (finding the scale through the maximum text can ensure that the height will not be greater than 80PX), and finally multiplies the value of each text by the scale Math .floor(osz*bl), find the height value corresponding to each em.

Every time the icon is clicked in the subsequent click event, Arr and Arr2 are reset accordingly, which ensures that the values ​​are updated in real time. . . OK, it’s over here,

Final result:

I hope this article will be helpful to everyone in jQuery programming.