微信小程序中如何在wx：for里判断具体哪一个页面跳转

<view class='function_container'>

<view class='function_item' bindtap='readData' wx:for="{{functions}}" wx:for-index="idx" wx:for-item="function">

<image class='function_img' src='{{function.pic_url}}' mode='aspectFit' />

<view data-id="{{function.id}}" class='function_name'>{{function.name}}</view>

</view>

</view>

//js

page({

data:{

functions: [

{

"name": "库存",

"pic_url": '../image/half-star.png',

},

{

"name": "报表",

"pic_url": '../image/half-star.png'

},

{

"name": "商品管理",

"pic_url": '../image/half-star.png'

},

{

"name": "订货",

"pic_url": '../image/half-star.png'

},

{

"name": "飞机票",

"pic_url": '../image/half-star.png'

},

{

"name": "火车票",

"pic_url": '../image/half-star.png'

},

{

"name": "手机充值",

"pic_url": '../image/half-star.png'

},

{

"name": "水电煤",

"pic_url": '../image/half-star.png'

}

]

},

}

})

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