Constant 常量

Var/let 變量

// 一般用let 而不用var

operators?

• Mathematical/algorithmic operators

* * 平方(exponent= to the power of )

+ 可以連接字符串(string)

• Assignment operators

x +=a? (x=x+a)

x *=a (x=x*a)

++ (x=x+1)

• Comparison operators

>

<

Strings and template laterals

template literals

``backtip= show exactly what the string looks like

if else control structure

if () {

}

else {

}

conversion

js can only perform expression

can not perform statement (e.g. if-else statement0

ternary operators

? : ------- if else statement

strict mode: safer and indicate errors

one function to call another function

P 37 June 9