js树形菜单递归生成列表

记录树形菜单递归生成列表：

<script type="text/javascript">
var obj = [
  {title:'标题1',children:[{title:'标题1-1',children:[{title:'标题1-2',children:[{title:'标题1-3'}]}]}]},
  {title:'标题2',children:[{title:'标题2-1',children:[{title:'标题2-2',children:[{title:'标题2-3'}]}]}]},
  {title:'标题3',children:[{title:'标题3-1',children:[{title:'标题3-2',children:[{title:'标题3-3'}]}]}]},
];
var item,level=0,str = '|',tree = [];
getTree(obj,level);
function getTree(obj,level){
  level++;
  if(level > 1){
    for(let i=2; i<=level; ++i){
      str += '—';
    }
  }
  for(let i in obj){
    item = obj[i];
    tree.push((level > 1) ? (str+item['title']) : item['title']);
    if(item['children'] && item['children'].length){
      getTree(item['children'],level);
    }
    level = 0;
    str = '|';
  }
}
console.log(tree);
</script>

结果示例：

打完收工。