复制代码 代码如下:

<script type=\"text/javascript\">
Object.prototype.extend = function(obj){
 //在函数里，把obj属性复制到自身
 for(var k in obj){
  if(obj.hasOwnProperty(k)){
   if(this[k] == undefined){
    this[k] = obj[k];
   }
  }
 }
}
var kitty = {color:\'yellow\',climb:function(){alert(\'我会爬树\');}};
var tiger = {color:\'yellow and black\'};
tiger.extend(kitty);
tiger.climb();
</script>