Mysql常用函数的汇总，可看下面文章
https://www.cnblogs.com/poloyy/p/12890763.html
返回指定日期时间的日期部分
DATE(expr)
SELECT DATE('1987-01-01 16:00:00'); # 1987-01-01 SELECT DATE(CURTIME()); # 2020-05-17 SELECT DATE(CURRENT_TIMESTAMP); # 2020-05-17
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球球与墩墩：这不是前端常考的对象扁平化吗，面试官像是前端出来的
const flattern = (obj) => {
const res = {};
const dfs = (curr, path) => {
if(typeof curr === 'object' && curr !== null) {
const isArray = Array.isArray(curr);
for(let key in curr) {
const newPath = path ? isArray ? `${path}[${key}]` : `${path}.${key}` : key;
dfs(curr[key], newPath);
}
} else {
res[path] = curr
}
}
dfs(obj);
return res;
}
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