通過運算式、函數給React組件屬性賦值

最後更新：2015-12-16 來源：互聯網

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一、需求

當有傳屬性name的值時，則顯示Hello "name",否則顯示Hello World

二、4種方式的代碼實現

1.通過三元運算子

<!DOCTYPE html><html lang="zh-cn"><head>    <meta charset="UTF-8">    <title>Document</title></head><body>    <script src="./react-0.13.2/build/react.js"></script>    <script src="./react-0.13.2/build/JSXTransformer.js"></script><script type="text/jsx">var style = {color : "red",border: "1px #000 solid",};var HelloWorld = React.createClass({render: function(){return <p>你好，{this.props.name ? this.props.name : "World!"} </p>;}});React.render(<div style={style}><HelloWorld name="李小龍!"></HelloWorld></div>, document.body);</script></body></html>

2.通過變數

<!DOCTYPE html><html lang="zh-cn"><head>    <meta charset="UTF-8">    <title>Document</title></head><body>    <script src="./react-0.13.2/build/react.js"></script>    <script src="./react-0.13.2/build/JSXTransformer.js"></script><script type="text/jsx">var style = {color : "red",border: "1px #000 solid",};var HelloWorld = React.createClass({getName : function(){if(this.props.name)return this.props.nameelsereturn "World!"},render: function(){var name = this.getName();return <p>你好， {name}</p>;}});React.render(<div style={style}><HelloWorld name="李小龍!"></HelloWorld></div>, document.body);</script></body></html>

3.直接在屬性調用函數

<!DOCTYPE html><html lang="zh-cn"><head>    <meta charset="UTF-8">    <title>Document</title></head><body>    <script src="./react-0.13.2/build/react.js"></script>    <script src="./react-0.13.2/build/JSXTransformer.js"></script><script type="text/jsx">var style = {color : "red",border: "1px #000 solid",};var HelloWorld = React.createClass({getName : function(){if(this.props.name)return this.props.nameelsereturn "World!"},render: function(){return <p>你好， {this.getName()}</p>;}});React.render(<div style={style}><HelloWorld name="李小龍!"></HelloWorld></div>, document.body);</script></body></html>

4.用與運算

<!DOCTYPE html><html lang="zh-cn"><head>    <meta charset="UTF-8">    <title>Document</title></head><body>    <script src="./react-0.13.2/build/react.js"></script>    <script src="./react-0.13.2/build/JSXTransformer.js"></script><script type="text/jsx">var style = {color : "red",border: "1px #000 solid",};var HelloWorld = React.createClass({render: function(){return <p>你好， {this.props.name || "World!"}</p>;}});React.render(<div style={style}><HelloWorld name="李小龍!"></HelloWorld></div>, document.body);</script></body></html>

三、運行結果

通過運算式、函數給React組件屬性賦值

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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