js用for-in循环遍历（key-value）对象，根据key值读取value

var MSG={
    
    
process_success :{
    
    code:200,msg:"Success"},
service_unavailable :{
    
    code:5031001,msg:"Server exception"},
wrong_url : {
    
    code:4041001,msg:"Wrong url"},
}

拿到code的方法：

for(var e in MSG){
    
    
    console.log(MSG[e].code)
    
}

半年不碰前端，基本功忘的干干净净，我哭