2018-10-10 18:03:03 -04:00
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---
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id: 5a24c314108439a4d403616e
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2020-12-16 00:37:30 -07:00
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title: 使用 this.props 访问 Props
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2018-10-10 18:03:03 -04:00
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challengeType: 6
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2020-09-18 00:13:42 +08:00
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forumTopicId: 301375
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2021-01-13 03:31:00 +01:00
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dashedName: access-props-using-this-props
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2018-10-10 18:03:03 -04:00
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---
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2020-12-16 00:37:30 -07:00
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# --description--
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2020-09-18 00:13:42 +08:00
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前几项挑战涵盖了将 props 传递给子组件的基本方法。但是,倘若接收 prop 的子组件不是无状态函数组件,而是一个 ES6 类组件又当如何呢?ES6 类组件访问 props 的方法略有不同。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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任何时候,只要引用类组件本身,就要使用`this`关键字。要访问类组件中的 props,你需要在在访问它的代码前面添加`this`。例如,如果 ES6 类组件有一个名为`data`的 prop,你可以在 JSX 中这样写:`{this.props.data}`。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --instructions--
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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在父组件`ResetPassword`中渲染`ReturnTempPassword`组件的一个实例。在这里,为`ReturnTempPassword`提供一个`tempPassword`prop,并赋值给 prop 一个长度至少为 8 个字符的字符串。在子组件`ReturnTempPassword`中,访问`strong`标签中的`tempPassword`prop,以确保用户看到临时密码。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --hints--
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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`ResetPassword`组件应该返回单个`div`元素。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ResetPassword));
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return mockedComponent.children().type() === 'div';
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})()
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);
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```
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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`ResetPassword`的第四个子组件应该是`ReturnTempPassword`组件。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ResetPassword));
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2018-10-10 18:03:03 -04:00
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return (
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2020-12-16 00:37:30 -07:00
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mockedComponent.children().childAt(3).name() === 'ReturnTempPassword'
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2018-10-10 18:03:03 -04:00
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);
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2020-12-16 00:37:30 -07:00
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})()
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);
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2018-10-10 18:03:03 -04:00
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```
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2020-12-16 00:37:30 -07:00
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`ReturnTempPassword`组件应该有一个名为`tempPassword`的属性。
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2018-10-10 18:03:03 -04:00
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```js
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2020-12-16 00:37:30 -07:00
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ResetPassword));
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return mockedComponent.find('ReturnTempPassword').props().tempPassword;
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})()
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);
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2018-10-10 18:03:03 -04:00
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```
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2020-12-16 00:37:30 -07:00
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`ReturnTempPassword`组件的`tempPassword`prop 值应该是一个字符串,其长度至少为`8`。
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2020-09-18 00:13:42 +08:00
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2018-10-10 18:03:03 -04:00
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```js
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2020-12-16 00:37:30 -07:00
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ResetPassword));
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const temp = mockedComponent.find('ReturnTempPassword').props()
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.tempPassword;
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return typeof temp === 'string' && temp.length >= 8;
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})()
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);
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```
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2020-09-18 00:13:42 +08:00
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2020-12-16 00:37:30 -07:00
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`ReturnTempPassword`组件应该显示你作为`tempPassword`prop 创建的密码,并且密码显示在`strong`标签中。
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2020-09-18 00:13:42 +08:00
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2020-12-16 00:37:30 -07:00
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ResetPassword));
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2020-09-18 00:13:42 +08:00
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return (
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2020-12-16 00:37:30 -07:00
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mockedComponent.find('strong').text() ===
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mockedComponent.find('ReturnTempPassword').props().tempPassword
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2020-09-18 00:13:42 +08:00
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);
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2020-12-16 00:37:30 -07:00
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})()
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);
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2021-01-13 03:31:00 +01:00
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# --seed--
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## --after-user-code--
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```jsx
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ReactDOM.render(<ResetPassword />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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class ReturnTempPassword extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<div>
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{ /* Change code below this line */ }
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<p>Your temporary password is: <strong></strong></p>
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{ /* Change code above this line */ }
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</div>
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);
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}
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};
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class ResetPassword extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<div>
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<h2>Reset Password</h2>
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<h3>We've generated a new temporary password for you.</h3>
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<h3>Please reset this password from your account settings ASAP.</h3>
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{ /* Change code below this line */ }
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{ /* Change code above this line */ }
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</div>
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);
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}
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};
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```
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2020-12-16 00:37:30 -07:00
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# --solutions--
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2021-01-13 03:31:00 +01:00
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```jsx
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class ReturnTempPassword extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<div>
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<p>Your temporary password is: <strong>{this.props.tempPassword}</strong></p>
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</div>
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);
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}
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};
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class ResetPassword extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<div>
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<h2>Reset Password</h2>
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<h3>We've generated a new temporary password for you.</h3>
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<h3>Please reset this password from your account settings ASAP.</h3>
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{ /* Change code below this line */ }
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<ReturnTempPassword tempPassword="serrPbqrPnzc" />
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{ /* Change code above this line */ }
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</div>
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);
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}
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};
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```
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