let menu = { name: '一級菜單', data: { name: '二級菜單', data: { name: '三級菜單', data: { name: '四級菜單' } } } }; function f(s){ for(var i in s){ if(typeof s[i]=="object"){ f(s[i]) }else{ console.log(s[i]); } } } f(menu);