Javascript - Advanced
Equals
”==” vs “===” AND “!=” vs “!==”
- 三等号需要类型和值都相等
- 双等号只要求值相等，如果类型不同会做转换
when two operands are of the same type and have the same value, then === produces true and !== produces false; when the operands are of the same type, but if they are of different types, == and != attempt to coerce the values
Example
100 == "100" // true
100 === "100" // false
0 == '' // true
0 === '' // false
Quotes
double quotes “” vs single quotes ‘’
- There is no special difference between single and double quotes.
(You don’t need to escape single quotes in double quotes, or double quotes in single quotes)
