Javascript/Jquery-现有两个数组的新数组

Question

我有两个数组

 var a= $("#update-select1").val();  // gives value 1,2,4
 var b= $("#update-select2").val();  // 1,2,5

我想要与上述两个数组不同的两个数组。

//array has the values which is in  `b` but not in `a`
var c = [5]

//another array has value in `a` but not in `b`
var d =[4]

Answer 1

您可以这样使用Array.filter:

var c = [1,2,5]
          .filter(function(a){return this.indexOf(a) === -1},[1,2,4]); //=> [5]
var d = [1,2,4]
          .filter(function(a){return this.indexOf(a) === -1},[1,2,5]); //=> [4]

或者:

function notIn(a){
   return this.indexOf(a) === -1;
}
var a = [1,2,4]
   ,b = [1,2,5]
   ,c = b.filter(notIn,a)
   ,d = a.filter(notIn,b);

See also