HTML标签 与 React组件 对比_html/css_WEB-ITnose
预计阅读时间: 5 分钟
–React 的 JSX 里约定分别使用首字母大、小写来区分本地组件的类和 HTML 标签。
要渲染 HTML 标签，只需在 JSX 里使用小写字母开头的标签名
var myDivElement = <div className="foo" />;React.render(myDivElement, document.body);
要渲染 React 组件，只需创建一个大写字母开头的本地变量。
var MyComponent = React.createClass({/*...*/});var myElement = <MyComponent someProperty={true} />;React.render(myElement, document.body);转换
JSX 把类 XML 的语法转成纯粹 JavaScript
var Nav;// 输入 (JSX):var app = <Nav color="blue" />;// 输出 (JS):var app = React.createElement(Nav, {color:"blue"});//注意，要想使用 <Nav />，Nav 变量一定要在作用区间内。JSX 也支持使用 XML 语法定义子结点
var Nav, Profile;// 输入 (JSX):var app = <Nav color="blue"><Profile>click</Profile></Nav>;// 输出 (JS):var app = React.createElement(Nav,{color:"blue"},React.createElement(Profile, null, "click"));JavaScript 表达式
属性表达式要使用 JavaScript 表达式作为属性值， 只需把这个表达式用一对大括号 ({}) 包起来，不要用引号 ("")。
// 输入 (JSX):var person = <Person name={window.isLoggedIn ? window.name : ''} />;// 输出 (JS):var person = React.createElement(Person,{name: window.isLoggedIn ? window.name : ''});子节点表达式
// 输入 (JSX):var content = <Container>{window.isLoggedIn ? <Nav /> : <Login />}</Container>;// 输出 (JS):var content = React.createElement(Container,null,window.isLoggedIn ? React.createElement(Nav) : React.createElement(Login));注释你只需要在一个标签的子节点内(非最外层)小心地用 {} 包围要注释的部分。
var content = (<Nav>{/* 一般注释, 用 {} 包围 */}<Person/* 多行注释 */name={window.isLoggedIn ? window.name : ''} // 行尾注释/></Nav>);
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