js 深复制

兼容大部分浏览器

Object.assign({}, array or object);

兼容IE

function clone(obj) 
{
   var o;
   if (typeof obj == "object") 
   {
      if (obj === null) 
      {
         o = null;
      } 
      else 
      {
         if (obj instanceof Array) 
         {
            o = [];
            for (var i = 0, len = obj.length; i < len; i++) 
            {
               o.push(clone(obj[i]));
            }
         }
         else 
         {
            o = {};
            for (var j in obj) 
            {
               o[j] = clone(obj[j]);
            }
         }
      }
    } 
    else 
    {
       o = obj;
    }
    return o;
}