假设我有数组[1,2,3,5,2,1,4]。如何让 JS 返回[3,4,5]?
我在这里查看了其他问题，但它们都是关于删除多次出现的数字的副本，而不是原始文件和副本。
Thanks!
Use Array#filter https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter方法两次。
var data = [1, 2, 3, 5, 2, 1, 4];
// iterate over elements and filter
var res = data.filter(function(v) {
// get the count of the current element in array
// and filter based on the count
return data.filter(function(v1) {
// compare with current element
return v1 == v;
// check length
}).length == 1;
});
console.log(res);
或者使用另一种方式Array#indexOf https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf and Array#lastIndexOf https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf方法。
var data = [1, 2, 3, 5, 2, 1, 4];
// iterate over the array element and filter out
var res = data.filter(function(v) {
// filter out only elements where both last
// index and first index are the same.
return data.indexOf(v) == data.lastIndexOf(v);
});
console.log(res);
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