替换空格

请实现一个函数，把字符串 s 中的每个空格替换成"%20"。

示例 1：

输入：s = "We are happy."
输出："We%20are%20happy."

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/**
 * @param {string} s
 * @return {string}
 */
var replaceSpace = function(s) {
    let len = s.length
    let arr = new Array(len * 3).fill(0)
    let size = 0

    for(let i = 0; i < len; i++) {
        if(s[i] === ' ') {
            arr[size] = "%"
            arr[size + 1] = "2"
            arr[size + 2] = "0"

            size += 3
        } else {
            arr[size] = s[i]
            size++
        }
    }

    return arr.slice(0, size).join("")
};

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来源：力扣（LeetCode）链接：https://leetcode-cn.com/problems/ti-huan-kong-ge-lcof

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