app.js
App({
    globalData: {
        resBaseUrl: 'https://xxxxxx'
    }
})


pages页js
const app = getApp();

pages({
  onLoad: function () {
    this.setData({
       resBaseUrl: app.globalData.resBaseUrl
    })
  }

})

//   /pages/tools.wxs
var foo = "'hello world' from tools.wxs";
var bar = function (d) {
  return d;
}
module.exports = {
  FOO: foo,
  bar: bar,
};
module.exports.msg = "some msg";

<!-- page/index/index.wxml -->
 
<wxs src="./../tools.wxs" module="tools" />//src="path" 引入一个wxs,并使用该.wxs所暴漏的模块，别名为 module = "name"
<view> {{tools.msg}} </view>
<view> {{tools.bar(tools.FOO)}} </view>

<!--wxml-->
<wxs module="m1">
var msg = "hello world";
 
module.exports.message = msg;
</wxs>
 
<view> {{m1.message}} </view>

<view id="tapTest" data-hi="WeChat" bindtap="tapName">Click me!</view>

js文件：
Page({
  tapName(event) {
    console.log(event)
  }
})    

<wxs module="wxs" src="./test.wxs"></wxs>
<view id="tapTest" data-hi="WeChat" bindtap="{{wxs.tapName}}">Click me!</view>
**注：绑定的WXS函数必须用{{}}括起来**

function tapName(event, ownerInstance) {
  console.log('tap wechat', JSON.stringify(event))
}
module.exports = {
  tapName: tapName
}