// 数字有效值 [0 , 2^32 - 2] ,其他数字就当字符串
console.log(Object.keys({
2: 'aa',
1: 'cc',
0: 'dd',
3: 'bb'
}))// [ '0', '1', '2', '3' ]
console.log(Object.keys({
2: 'aa',
1: 'cc',
'-4': 'dd',
'-1': 'dd',
3: 'bb'
}))// [ '1', '2', '3', '-4', '-1' ]
console.log(Object.keys({
c: 11,
bb: 22,
a: 33
}))// [ 'c', 'bb', 'a' ]
console.log(Object.keys({
2: 11,
1: 22,
b: 33,
a: 44,
3: 55
}))// [ '1', '2', '3', 'b', 'a' ]
console.log(Object.keys({
[Symbol()]: 1,
}))// []
console.log(Object.keys({
[true]: 1,
[undefined]: 1,
[null]: 1,
[/0-1/]: 1,
[Math]: 1,
}))// [ 'true', 'undefined', 'null', '/0-1/', '[object Math]' ]
console.log(Object.keys({
2: 'aa',
f: 5,
1: 'd',
4294967295: 'cc', // 2^32 - 1
d: 4,
'-3': 'bb',
4294967294: 'cc', // 2^32 - 2
}))// [ '1', '2', '4294967294', 'f', '4294967295', 'd', '-3' ]
console.log(Object.keys('omg'))// [ '0', '1', '2' ]
console.log(Object.keys(["a", "c", "b"]))// [ '0', '1', '2' ]
console.log(Object.keys(["a", "c", "b"]))// [ '0', '1', '2' ]
Object.keys()遇到那些问题
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转载自blog.csdn.net/formylovetm/article/details/127380180
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