【js学习笔记-026】-- 语句

 with(object)

  statement

  这条语句将object插入到作用域链头部，然后执行statement,最后把作用域链恢复到原始状态。（不建议使用，移植性不好，效率低等特点）

语句

语法

用途

break

break [label]

 

case

case expression

 

contine

continue [lable]

 

debugger

debugger

 

default

default;

 

do/while

do statement while(expression)

 

empty

;

 

for

for(init,test,incr)

 

for/in

for(var in object)

 

function

fucntion name(param[],….){statement}

 

If/else

if(expr)statement1 else statement2

 

label

label:statement

 

return

return [expression]

 

switch

switch(expression){statements}

 

throw

throw expression

 

try

try{statements}[catch{handler statemnts}][finally{cleanup statements}]

 

use stric

“use strict”

 

var

var name=[=expr][,…..]

 

while

while (expression) statement

 

with

with(object) statement