-_-#傻傻分不清楚

var arr = []

var index = 0

var postfix = 0

for (; index < 10; index++) {

    postfix = 0

    console.log(postfix) // 0 0 0 0 0 0 0 0 0 0

    for (; postfix < 100; postfix++) {

        arr.push(index * 100 + postfix)

    }

}

console.log(arr, arr.length) // ... 1000



arr = []

index = 0

postfix = 0

for (; index < 10; index++) {

    console.log(postfix) // 0 100 100 100 100 100 100 100 100 100

    for (; postfix < 100; postfix++) {

        arr.push(index * 100 + postfix)

    }

}

console.log(arr, arr.length) // ... 100