js 数组去重（单元素和对象数组）

Question

源码

Array.prototype.unique = function(key) {
    var arr = this;
    var n = [arr[0]];
    for (var i = 1; i < arr.length; i++) {
        if (key === undefined) {
            if (n.indexOf(arr[i]) == -1) n.push(arr[i]);
        } else {
            inner: {
                var has = false;
                for (var j = 0; j < n.length; j++) {
                    if (arr[i][key] == n[j][key]) {
                        has = true;
                        break inner;
                    }
                }
            }
            if (!has) {
                n.push(arr[i]);
            }
        }
    }
    return n;
}

使用方法：

[1,2,3,4,3,2].unique()
//[1,2,3,4]

[{a:1},{a:2},{a:1}].unique('a')
//[{a:1},{a:2}]

Answer 1

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