js Object.keys(map)列出map添加刪除key，及其key列表

var map = {}; map["a"] = 1; map["b"] = 2; console.log(Object.keys(map)); //[ 'a', 'b' ] console.log(map); //{ a: 1, b: 2 } delete map["a"]; console.log(map);

>>阅读原文<<