Vue中相同逻辑实现抽离

vue.mixin 用法 给组件每个生命周期，函数等都混入一些公共逻辑
原理源码

Vue.mixin = function (mixin: Object) { 
this.options = mergeOptions(this.options, mixin); // 将当前定义的属性合并到每个 
组件中
return this 
}
核心
export function mergeOptions ( 
parent: Object, 
child: Object, 
vm?: Component 
): Object { 
if (!child._base) { 
if (child.extends) { // 递归合并extends 
parent = mergeOptions(parent, child.extends, vm) 
}
if (child.mixins) { // 递归合并mixin 
for (let i = 0, l = child.mixins.length; i < l; i++) { 
parent = mergeOptions(parent, child.mixins[i], vm) 
} 
} 
}
const options = {} // 属性及生命周期的合并 
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 
// 调用不同属性合并策略进行合并 
options[key] = strat(parent[key], child[key], vm, key) 
}
return options 
}