UniApp，在微信小程序下，使用Hook来完成分享

在微信小程序中，如果多个页面都有分享的配置，大部分会考虑将分享的代码封装一下然后各个页面按需调用，一般人写法会是这样

// share.ts
import { onShareAppMessage, onShareTimeline } from '@dcloudio/uni-app'

const home = '/pages/home'

export interface ShareOptions {
    title?: string
    path?: string
    imageUrl?: string
    query?: AnyObject
}

export function useMpShare() {
    function share(
        optionsFn: (() => ShareOptions) | ShareOptions = () => ({
            title: '小程序名称',
            path: '',
            imageUrl: '',
            query: {},
        })
    ) {
        onShareAppMessage(() => {
            const options = typeof optionsFn === 'function' ? optionsFn() : optionsFn
            return buildOptions(options)
        })
    }

    return { share }
}

// home.vue
import { useMpShare } from '@/hooks/use-share'
const { share }  = useMpShare()
share()

正常看这样确实没问题，但是上真机测试后，发现，传入的自定义title不起作用。查阅文档和测试后发现，需要做以下改动

// share.ts
import { onShareAppMessage, onShareTimeline } from '@dcloudio/uni-app'

const home = '/pages/home'

export interface ShareOptions {
    title?: string
    path?: string
    imageUrl?: string
    query?: AnyObject
}

export function useMpShare() {
    function share(
        optionsFn: (() => ShareOptions) | ShareOptions = () => ({
            title: '小程序名称',
            path: '',
            imageUrl: '',
            query: {},
        })
    ) {
        onShareAppMessage(() => {
            const options = typeof optionsFn === 'function' ? optionsFn() : optionsFn
            return buildOptions(options)
        })
    }

    return { onShareAppMessage: share } // 将暴露出去的函数名改为 onShareAppMessage
}

// home.vue
import { useMpShare } from '@/hooks/use-share'
const { onShareAppMessage }  = useMpShare()
onShareAppMessage({ title: '此页面的title' })

另外，参数的传入如果是个动态值也有要求

// home.vue
import { useMpShare } from '@/hooks/use-share'
const { onShareAppMessage }  = useMpShare()
const options = { title: '如果title需要动态赋值' }
onShareAppMessage(() => options) // onShareAppMessage 必须在根上进行调用，不能在请求完成后调用

api.fetchData().then((r) => options.title = r.title)