for in 循环()-其他

for in 循环()

for in 循环为遍历对象构建

obj={a:’1′,b:’2′,c:’3′}

for( let key in obj){

　　console.log( key +  ‘=>’  + obj[key])

}

结果:

a=>1

b=>2

c=>3

for in 循环为遍历对象构建

obj={a:’1′,b:’2′,c:’3′}

for( let key in obj){

　　console.log( key +  ‘=>’  + obj[key])

}

结果:

a=>1

b=>2

c=>3