for in 的动态下标是string类型 for 循环是number
let aaa = ["a","b","c"]
for (let i = '0'; i <=aaa.length; i++) {
typeof i
}
"number"
for (let i in aaa) {
typeof i
}
"string"
for in 的动态下标是string类型 for 循环是number
let aaa = ["a","b","c"]
for (let i = '0'; i <=aaa.length; i++) {
typeof i
}
"number"
for (let i in aaa) {
typeof i
}
"string"
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