<!DOCTYPE html> <html> <head> <title>test013_Array_prototype_unique()</title> </head> <script type="text/javascript"> Array.prototype.unique = function() { var a = {}; for (var i = 0; i < this.length; i++) { if (typeof a[this[i]] == "undefined") a[this[i]] = 1; } this.length = 0; for(var i in a) this[this.length] = i; return this; }; </script> <script type="text/javascript"> var a = [1,2,3]; var b = [2,3,4]; var c = a.concat(b).unique(); console.log(c); </script> <body> </body> </html>
例子中unique()方法是可以提成单独的文件的。
结果：
