Vue中相同邏輯實現抽離

vue.mixin 用法 給組件每個生命週期，函數等都混入一些公共邏輯
原理源碼

Vue.mixin = function (mixin: Object) { 
this.options = mergeOptions(this.options, mixin); // 將當前定義的屬性合併到每個 
組件中
return this 
}
核心
export function mergeOptions ( 
parent: Object, 
child: Object, 
vm?: Component 
): Object { 
if (!child._base) { 
if (child.extends) { // 遞歸合併extends 
parent = mergeOptions(parent, child.extends, vm) 
}
if (child.mixins) { // 遞歸合併mixin 
for (let i = 0, l = child.mixins.length; i < l; i++) { 
parent = mergeOptions(parent, child.mixins[i], vm) 
} 
} 
}
const options = {} // 屬性及生命週期的合併 
let key 
for (key in parent) { 
mergeField(key) 
}
for (key in child) { 
if (!hasOwn(parent, key)) { 
mergeField(key) 
} 
}
function mergeField (key) { 
const strat = strats[key] || defaultStrat 
// 調用不同屬性合併策略進行合併 
options[key] = strat(parent[key], child[key], vm, key) 
}
return options 
}