1.html
<1>localstorage,sessionstorage,cookie区别
2.css
<1>link和@import区别
link优先级高于@import
link兼容性好
link异步,@import同步
3.js
console.log(null==undefined)//true
console.log(Boolean(0))//false
console.log(Boolean(10))//true
console.log(Boolean('10'))//true
console.log(NaN==NaN)//false
console.log(NaN==0)//false