理顺 JavaScript (18) - 语句及运算符

if (..) { ... } 
else if (..) { ... } 
else { ... }

 
 
 
 
 

 

 
  

switch (..) {
  case A: ... break;
  case B: ... break;
  case C: ... break;
  default: ... break;
}

 
 
 
 
 

 

 
  

while (..) { ... } 

do ... while (..);

for (i=0; i<10; i++) { ... }

for (v in x) { ... }

//循环中可包含:
continue;
break;
break LabelName;

 
 
 
 
 

 

 
  

with (..) { ... }

 
 
 
 
 

 

 
  

throw new Error('异常');

try { ... }
catch { ... }
finally { ... }

 
 
 
 
 

 

 
  

运算符优先级:

15	. [] () new
14	++ -- - + ~ ! delete typeof void
13	* / %
12	+ -
11	<< >> >>>
10	< <= < >= instanceof in
9	== != === !==
8	&
7	^
6	|
5	&&
4	||
3	?:
2	= *= /= %= += -= <<= >>= >>>= &= ^= |=
1	,