2015.08.11-Background color switching function_html/css_WEB-ITnose

<div> class='red' id="box">美美哒！...........</div>

.red{   width:100px;   height:100px;   background-color:red;   border-radius:0 70px 0 60px ;   transition-duration:1s;}.yellow{ width:150px; height:150px; border-radius:80px 0 100px 0; transition-duration:1s; background-color:yellow;}

window.onload = function(){  var box = document.getElementById('box');  box.onclick = toYellow;};function toRed(){   this.className ='red';   this.onclick = toYellow;}function toYellow(){  this.className ='yellow';  this.onclick = toRed;}