helper.js
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// 从事件对象中解析得到 componentId
// 需要在元素上声明 data-component-id
export const getComponentByTag = (parent, tag) => {
for (let c of parent.$children) {
if (c.$options._componentTag === tag) {
return c
}
}
}
export const extractComponentId = (event = {}) => {
const { dataset: { componentId } } = event.currentTarget || {}
return componentId
}
/*
注：默认合并所有生命周期函数
配置合并指定的生命周期 or 忽略指定字段
const extend = extendCreator({
life: ['onLoad', 'onPullDownRefresh'],
exclude: ['binder']
});
Page(extend({}, {
onLoad() {},
...
}));
*/
const LIFE_CYCLE = ['onLoad', 'onReady', 'onShow', 'onHide', 'onUnload', 'onPullDownRefresh', 'onReachBottom', 'onShareAppMessage', 'onPageScroll']
const extendCreator = (config = {}) => {
const {
life = LIFE_CYCLE,
exclude = []
} = config
const excludeList = exclude.concat(LIFE_CYCLE.map(getFuncArrayName))
if (!Array.isArray(life) || !Array.isArray(exclude)) throw new Error('Invalid Extend Config')
let lifeCycleList = life.filter(item => LIFE_CYCLE.indexOf(item) >= 0)
return function extend (target, ...objList) {
objList.forEach((source) => {
if (source) {
let keys = Object.keys(source)
keys.forEach((key) => {
let value = source[key]
if (excludeList.indexOf(key) >= 0) return
if (lifeCycleList.indexOf(key) >= 0 && typeof value === 'function') {
let funcArrayName = getFuncArrayName(key)
if (!target[funcArrayName]) {
target[funcArrayName] = []
if (target[key]) {
target[funcArrayName].push(target[key])
}
target[key] = function (...rest) {
target[funcArrayName].forEach(func => func.apply(this, rest))
}
}
if (source[funcArrayName]) {
// 经过生命周期合并的组件直接整合函数列表
target[funcArrayName].push(...source[funcArrayName])
} else {
// 添加生命周期函数进入函数列表
target[funcArrayName].push(value)
}
} else {
target[key] = value
}
})
}
})
return target
}
}
const getFuncArrayName = name => `__$${name}`
export default {
extractComponentId,
extend: Object.assign,
extendCreator
}