135 lines
4.6 KiB
Markdown
135 lines
4.6 KiB
Markdown
---
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id: 5a24c314108439a4d403616e
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challengeType: 6
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forumTopicId: 301375
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title: 使用 this.props 访问 Props
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---
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## Description
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<section id='description'>
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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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任何时候，只要引用类组件本身，就要使用<code>this</code>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<code>this</code>。例如，如果 ES6 类组件有一个名为<code>data</code>的 prop，你可以在 JSX 中这样写：<code>{this.props.data}</code>。
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</section>
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## Instructions
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<section id='instructions'>
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在父组件<code>ResetPassword</code>中渲染<code>ReturnTempPassword</code>组件的一个实例。在这里，为<code>ReturnTempPassword</code>提供一个<code>tempPassword</code>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<code>ReturnTempPassword</code>中，访问<code>strong</code>标签中的<code>tempPassword</code>prop，以确保用户看到临时密码。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>ResetPassword</code>组件应该返回单个<code>div</code>元素。
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testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().type() === 'div'; })());
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- text: <code>ResetPassword</code>的第四个子组件应该是<code>ReturnTempPassword</code>组件。
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testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().childAt(3).name() === 'ReturnTempPassword'; })());
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- text: <code>ReturnTempPassword</code>组件应该有一个名为<code>tempPassword</code>的属性。
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testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find('ReturnTempPassword').props().tempPassword; })());
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- text: <code>ReturnTempPassword</code>组件的<code>tempPassword</code>prop 值应该是一个字符串，其长度至少为<code>8</code>。
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testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); const temp = mockedComponent.find('ReturnTempPassword').props().tempPassword; return typeof temp === 'string' && temp.length >= 8; })());
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- text: <code>ReturnTempPassword</code>组件应该显示你作为<code>tempPassword</code>prop 创建的密码，并且密码显示在<code>strong</code>标签中。
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testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find('strong').text() === mockedComponent.find('ReturnTempPassword').props().tempPassword; })());
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='jsx-seed'>
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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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</div>
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### After Test
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<div id='jsx-teardown'>
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```js
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ReactDOM.render(<ResetPassword />, document.getElementById('root'))
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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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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</section>
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