weex slider实现滑动底部导航功能

<template>
 <div :style="{height:`${totalheight}px`}">
 <slider style="flex:1;" @change="onchange" :index="page">
 <div class="frame" v-for="img in imageList">
 <image class="image" resize="cover" :src="img.src"></image>
 <text class="contenttext">这是第{{page+1}}页</text>
 </div>
 </slider>
 <text style="background-color:gray;height:2px;bottom:100px;"/>
 <div class="nav">
 <div class="link" @click="changepage(0)">
 <image id="image1" v-bind:src="src1" class="logo"></image>
 <text class="title" :style="{color:page === 0?'#00BBE4':'gray'}">首页{{pathchanged}}</text>
 </div>
 <div class="link" @click="changepage(1)">
 <image v-bind:src="src2" class="logo"></image>
 <text class="title" :style="{color:page === 1?'#00BBE4':'gray'}">分类</text>
 </div>
 <div class="link" @click="changepage(2)">
 <image v-bind:src="src3" class="logo"></image> 
 <text class="title" :style="{color:page === 2?'#00BBE4':'gray'}">我的</text>
 </div>
 </div>
 </div>
</template>
<style scoped>
 .image {
 width: 750px;
 height: 700px;
 }
 .slider {
 width: 750px;
 height: 700px;
 border-width: 2px;
 border-style: solid;
 border-color: #41B883;
 }
 .frame {
 width: 750px;
 height: 700px;
 position: relative;
 }
 .logo {
 position: relative;
 width: 45px;
 height: 45px;
 }
 .nav {
 position: absolute;
 width: 750px;
 bottom: 0px;
 flex-direction: row;
 flex-wrap: nowrap;
 justify-content: space-between;
 align-items: center;
 }
 .link {
 width: 162.5px;
 flex-shrink: 1;
 text-align: center;
 margin:0 auto;
 padding: 3px;
 align-items: center;
 }
 .title {
 font-size: 25px;
 line-height: 35px;
 text-align: center;
 top: 5px;
 }
 .contenttext {
 font-size: 32px;
 line-height: 35px;
 text-align: center;
 top: 25px;
 color: 38px;
 color: red;
 } 
</style>
<script>
 export default {
 data () {
 return {
 page:0,
 imageList: [
  { src: 'https://gd2.alicdn.com/bao/uploaded/i2/T14H1LFwBcXXXXXXXX_!!0-item_pic.jpg'},
  { src: 'https://gd1.alicdn.com/bao/uploaded/i1/TB1PXJCJFXXXXciXFXXXXXXXXXX_!!0-item_pic.jpg'},
  { src: 'https://gd3.alicdn.com/bao/uploaded/i3/TB1x6hYLXXXXXazXVXXXXXXXXXX_!!0-item_pic.jpg'}
 ],
 src1: "../../../assets/home_btn_home_s.png",
 src2: "../../../assets/home_btn_rent.png",
 src3: "../../../assets/cut.png"
 }
 },
 methods:{
 onchange(evtValue){
  this.page=evtValue.index 
 },
 changepage(page){
 this.page=page
 }
 },
 computed: {
 totalheight(){
 const height = 750/weex.config.env.deviceWidth*weex.config.env.deviceHeight 
 return height-180
 },
 pathchanged(){ 
  var self = this
  if(self.page === 0){
  self.src1 = "../../../assets/home_btn_home_s.png"
  self.src2 = "../../../assets/home_btn_rent.png"
  self.src3 = "../../../assets/cut.png"
  }else if(self.page === 1){
  self.src1 = "../../../assets/home_btn_home.png"
  self.src2 = "../../../assets/home_btn_rent_s.png"
  self.src3 = "../../../assets/cut.png"
  }else if(this.page === 2){
  self.src1 = "../../../assets/home_btn_home.png"
  self.src2 = "../../../assets/home_btn_rent.png"
  self.src3 = "../../../assets/cut_on.png"
  } 
 return ''
 } 
 }
 }
</script>