微信小程序换肤功能实现代码(思路详解)

<view class="page" id='{{skin}}'> 
 <view class="container">
 	...
 </view>
</view>

/ app.wxss主题颜色 /
 
/ 深黑 /
#dark-skin{
 background: #000;
}
#dark-skin .bColor{
 background: #333;
 color: #999;
}
#dark-skin .borderColor{
 border-color:#999;
}
/ 粉红 /
#red-skin{
 background: #f9e5ee;
}
#red-skin .bColor{
 background: #f9e5ee;
 color: #8e5a54;
}
#red-skin .borderColor{
 border-color:#8e5a54;
}
/ 橘黄 /
#yellow-skin{
 background: #f6e1c9;
}
#yellow-skin .bColor{
 background: #f6e1c9;
 color: #8c6031;
}
#yellow-skin .borderColor{
 border-color:#8c6031;
}

@import "style/skin/dark.wxss";

//wxml
//<view bindtap="setSkin" data-flag='yellow'>橘黄</view> 
//bindtap事件函数
 setSkin:function(e){
  var skin = e.target.dataset.flag;
 
  this.setData({
   skin: skin + '-skin',
   openSet:false
  })
 
  wx.setStorage({
   key: "skin",
   data: skin + '-skin'
  })
  app.setSkin(this);
 }

//app.js
App({
 data: {
 },
 setSkin:function(that){
  wx.getStorage({
   key: 'skin',
   suess: function(res) {
    if(res){
     that.setData({
     skin: res.data
    })
     var fcolor = res.data == 'dark-skin' ? '#ffffff' : '#000000',
       obj = {
        'normal-skin':{
         color:'#000000',
         background:'#f6f6f6'
        },
        'dark-skin': {
         color: '#ffffff',
         background: '#000000'
        },
        'red-skin': {
         color: '#8e5a54',
         background: '#f9e5ee'
        },
        'yellow-skin': {
         color: '#8c6031',
         background: '#f6e1c9'
        },
        'green-skin': {
         color: '#5d6021',
         background: '#e3eabb'
        },
        'cyan-skin': {
         color: '#417036',
         background: '#d1e9cd'
        },
        'blue-skin': {
         color: '#2e6167',
         background: '#bbe4e3'
        }
       },
      item = obj[res.data],
      tcolor = item.color,
      bcolor = item.background;
 
     wx.setNavigationBarColor({
      frontColor: fcolor,
      backgroundColor: bcolor,
     })
 
     wx.setTabBarStyle({
      color: tcolor,
      backgroundColor: bcolor,
     })
    }
   }
  })
  }
})

const app = getApp();
 
Page({
 data: {
  skin: 'normal-skin',
 },
 onLoad: function() {
  app.setSkin(this); 
 },
 onShow:function(){
  app.setSkin(this); 
 }
})