inject和provide源码

inject和provide的使用方法，点击链接查看

在初始化时，执行了下面

callHook(vm, 'beforeCreate'); initInjections(vm); // resolve injections before data/props initState(vm); initProvide(vm); // resolve provide after data/props callHook(vm, 'created');

1.initInjections 函数

function initInjections (vm) { var result = resolveInject(vm.$options.inject, vm); if (result) { Object.keys(result).forEach(function (key) { { defineReactive$$1(vm, key, result[key], function () {警告不允许改}); } }); } }

2.resolveInject函数

function resolveInject (inject, vm) { if (inject) { var result = Object.create(null); var keys = Reflect.ownKeys(inject) for (var i = 0; i < keys.length; i++) { var key = keys[i]; if (key === '__ob__') { continue } var provideKey = inject[key].from; var source = vm; while (source) { if (source._provided && hasOwn(source._provided, provideKey)) { result[key] = source._provided[provideKey]; break } source = source.$parent; } if (!source) { if ('default' in inject[key]) { var provideDefault = inject[key].default; result[key] = typeof provideDefault === 'function' ? provideDefault.call(vm) : provideDefault; } else { warn(("Injection \"" + key + "\" not found"), vm); } } } return result } }

1.initProvide函数

function initProvide (vm) { var provide = vm.$options.provide; if (provide) { vm._provided = typeof provide === 'function' ? provide.call(vm) : provide; } }