js代码实现随机颜色的小方块

/**/js注释已删
 
 
 
   
   
   
   
 
 
   

     

       

     
   
 
 
 * {
  -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;
      box-sizing: border-box;
 }
 html {
  font-size:  px;
  -webkit-tap-highlight-color: transparent;
 }
 body {
  margin: ;
  padding: ;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size:  px;
  line-height: .    ;
  color: #  ;
  background-color: rgba(  ,  ,  , . );
 }
 .container {
  overflow: visible;
 }
 .main {
  position: relative;
  width:  %;
  height:  px;
  margin:auto;
 }
 .colorful {
  overflow: visible;
  width:  %;
  height:  %;
 }
 .colorful > a {
  float: left;
  display: block;
  width:  px;
  height:  px;
  zoom: ;
 }
 .colorful > a:hover {
  -webkit-animation:infinite s ease-in-out start-roll;
  -moz-animation:infinite s ease-in-out start-roll;
      animation:infinite s ease-in-out start-roll;
 }
 @-webkit-keyframes start-roll{
   % {
     -webkit-transform: rotate( deg); /*chrome*/
     -moz-transform: rotate( deg); /*火狐*/
     -ms-transform: rotate( deg); /*IE*/
     transform: rotate( deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
     zoom: ;
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity s linear;
     transition: opacity s linear;
     opacity: ;
     filter: alpha(opacity=  );
      zoom: ;
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
     zoom: ;
   }
 }
 @-moz-keyframes start-roll{
   % {
     -webkit-transform: rotate( deg); /*chrome*/
     -moz-transform: rotate( deg); /*火狐*/
     -ms-transform: rotate( deg); /*IE*/
     transform: rotate( deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity s linear;
     transition: opacity s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
 }
 @keyframes start-roll{
   % {
     -webkit-transform: rotate( deg); /*chrome*/
     -moz-transform: rotate( deg); /*火狐*/
     -ms-transform: rotate( deg); /*IE*/
     transform: rotate( deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity s linear;
     transition: opacity s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
    % {
     -webkit-transform: rotate(  deg); /*chrome*/
     -moz-transform: rotate(  deg); /*火狐*/
     -ms-transform: rotate(  deg); /*IE*/
     transform: rotate(  deg);
     -webkit-transition: opacity . s linear;
     transition: opacity . s linear;
     opacity: . ;
     filter: alpha(opacity= );
   }
 }
 (function (window) {
   var document = window.document;
   function on(elem, evtnm, eventhd) {
     var Onevtnm= 'on' + evtnm;
     elem[onevtnm] = eventhd;
   }
   function grc() {
     var val = [], i = ;
     while (++i <= ) {
       val.push(Math.floor(Math.random() *  ));
     }
     return 'rgb(' + val.join() + ')';
   }
   function fbc() {
     var el = document.querySelectorAll('.colorful')[ ],
       total = Math.floor(el.offsetWidth /  ) * Math.floor(el.offsetHeight /  ),
       df = document.createDocumentFragment(),
       a;
     while (total-- > ) {
       a = document.createElement('a');
       a.style.backgroundColor = grc();
       df.appendChild(a);
     }
     el.appendChild(df);
   }
   on(window, 'load', function () {
     fbc();
   });
 })(window)