前端笔试题目总结——应用JavaScript函数递归打印数组到HTML页面上

var item=[{
 name:‘Tom‘,
 age:70,
 child:[{
     name:‘Jerry‘,
     age:50,
     child:[{
        name:‘William‘,
        age:20
          }]
    },
    {
     name:‘Jessi‘,
     age:30
    }]
}];

 1 <ol>
 2     <li>name:Tom</li>
 3     <li>age:70</li>
 4     <li>children:
 5         <ol>
 6             <li>name:Jerry</li>
 7             <li>age:50</li>
 8             <li>children:
 9                 <ol>
10                     <li>name:William</li>
11                     <li>age:20</li>
12                 </ol>
13             </li>
14         </ol>
15         <ol>
16         <li>name:Jessi</li>
17         <li>age:30</li>
18         </ol>
19     </li>
20 </ol>

 1 var str="";
 2 function test(obj){
 3     for(var key in obj){
 4        str+="<ol>";
 5        if(obj[key].hasOwnProperty("name")){
 6              str=str+"<li>"+"name:"+obj[key].name+"</li>";
 7        }
 8       if (obj[key].hasOwnProperty("age")) {
 9           str=str+"<li>"+"age:"+obj[key].age+"</li>";
10            }
11         if(!obj[key].hasOwnProperty("child")){
12                str+="</ol>";
13             str+="</li>";
14             str+="</ol>";
15            }
16         if(obj[key].hasOwnProperty("child")){
17           str=str+"<li>"+"children:";
18           test(obj[key].child);
19            }
20     }    
21 }
22 test(item);
23 console.log("%s",str);