复制
1const fn1 = (str, obj) => {
2	let res = '';
3    // 标志位，标志前面是否有{
4	let flag = false;
5	let start;
6	for (let i = 0; i < str.length; i++) {
7		if (str[i] === '{') {
8			flag = true;
9			start = i + 1;
10			continue;
11		}
12		if (!flag) res += str[i];
13		else {
14			if (str[i] === '}') {
15				flag = false;
16				res += match(str.slice(start, i), obj);
17			}
18		}
19	}
20	return res;
21}
22// 对象匹配操作
23const match = (str, obj) => {
24	const keys = str.split('.').slice(1);
25	let index = 0;
26	let o = obj;
27	while (index < keys.length) {
28		const key = keys[index];
29		if (!o[key]) {
30			return `{${str}}`;
31		} else {
32			o = o[key];
33		}
34		index++;
35	}
36	return o;
37}
38