/utils/substring.wxs：
var subStr = function (val, start, stop) {
if (val) {
return val.substring(start, stop)
} else {
return ''
}
}
var subDate = function (val) {
if (val) {
return val.substring(5, 10)
} else {
return ''
}
}
module.exports = {
subStr: subStr,
subDate: subDate,
};
index.wxml
<!-- 引入文件 -->
<wxs src="../../utils/capture.wxs" module="tools" />
<!-- 调用tools.subDate方法截取字符串 -->
<view>{{tools.subDate(dataList)}}</view>
index.js
Page({
data: {
dataList: "123456789"
},
})
参考：https://blog.csdn.net/Shids_/article/details/124178613