javascript 数组相关操作

#数组去重
Array.prototype.unique = function(){ 
  this.sort(); //先排序 
  var res = [this[0]]; 
  for(var i = 1; i < this.length; i++){ 
    if(this[i] !== res[res.length - 1]){ 
    res.push(this[i]); 
    } 
  } 
  return res; 
}