1+“” = "1"

12345678901234567890 === 1234567890123456876568 true精度损失

parseInt("1234545")转整数

parseInt("26354ryhfg") NaN

[1,2,3,4].sort() 字典序排序

eval

const a = new Date()

a.getDate()

a.getMonth()

a.getDay()