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Object.keys
console.log(Object.keys({name:'lulu',age:455}));
console.log(Object.keys([124,457,124]));//返回的是索引数组
console.log(Object.keys("hello"));//返回的是索引数组
Object.values
console.log(Object.values({name:'lulu',age:455}));
console.log(Object.values([124,457,124]));
console.log(Object.values("hello"));
Object.entries
// 返回的是键值对的二维数组
console.log(Object.entries({name:'lulu',age:455}));
console.log(Object.entries([124,457,124]));
console.log(Object.entries("hello"));
- 遍历字符串也是可以的
