methods
initMethods
初始化组件实例的方法时,主要做以下几件事:
- (非生产环境下)校验方法,保证方法名是有效的
- 绑定方法的
this
,使其指向vm
- 将方法挂载到
vm
上
function initMethods (vm: Component, methods: Object) {
const props = vm.$options.props
for (const key in methods) {
if (process.env.NODE_ENV !== 'production') {
if (methods[key] == null) {
warn(
`Method "${key}" has an undefined value in the component definition. ` +
`Did you reference the function correctly?`,
vm
)
}
if (props && hasOwn(props, key)) {
warn(
`Method "${key}" has already been defined as a prop.`,
vm
)
}
if ((key in vm) && isReserved(key)) {
warn(
`Method "${key}" conflicts with an existing Vue instance method. ` +
`Avoid defining component methods that start with _ or $.`
)
}
}
vm[key] = methods[key] == null ? noop : bind(methods[key], vm)
}
}
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