xml转为json

<tab1>
	<tab1title>北京居民</tab1title>
	<tab1selected>true</tab1selected>
	<tab2>
		<tab2title>往来港澳通行证</tab2title>
		<tab2selected>true</tab2selected>
		<tab3>
			<tab3title>旅游</tab3title>
			<tab3selected>true</tab3selected>
		</tab3>
		<tab3>
			<tab3title>商务</tab3title>
			<tab3selected>false</tab3selected>
		</tab3>
	</tab2>
	<tab2>
		<tab2title>前往港澳通行证</tab2title>
		<tab2selected>false</tab2selected>
	</tab2>
</tab1>
<tab1>
	<tab1title>外省市居民</tab1title>
	<tab1selected>false</tab1selected>
	<tab2>
		<tab2title>往来港澳通行证</tab2title>
		<tab2selected>true</tab2selected>
	</tab2>
</tab1>

var tab1 = [
  {
		title: '北京居民',
		selected: true,
		tab2:[
			{
				title: '往来港澳通行证',
				selected: true,
				tab3: [
					{
						title: '旅游',
						selected: true
					},
					{
						title: '商务',
						selected: false
					}
				]					
			},
			{
				title: '前往港澳通行证',
				selected: false,	
			}
		]
	},
	{
		title: '北京居民',
		selected: true,
		tab2: [
			{
				title: '往来港澳通行证',
				selected: true,
			}
		]
	}
]