util.js
export let add = () = > {
this.setData({
index: 123
})}
util.js
export let add = () = > {
this.setData({
index: 123
})}
you can change the this direction with things like apply, and add uses ordinary functions.
export let add = function () {.}
const util=require ('.');
util.add.apply (this)
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