{childrenWithProps}
首先,在开发React之前,我认为应该是一件不太难的事,因为有比较丰富的backbone.js, marionette.js的开发经验,再加上大体了解它的思想,简单的认为和定义View的render,template的方法大同小异,只不过用了JSX奇怪的语法用javascript来代替html形式的模版。刚开始开发的时候,一个页面一个页面的像玩具一样的写,觉得还行,然后开始重构,把一些公共的部分,header,footer开始往layout组件上分配,然后一下子懵圈了,这怎么搞?直觉上把组件按照层次放应该可以吧,parent组件怎么render children组件呢?果然发现了this.props.children属性可以用在parent组件里用{this.props.children}来渲染children组件,写到这得时候还算顺利,然后,问题来了,NavBar的title属性需要在每个children组件里设置,{this.props.children}怎么把属性传递过去呢?还是在官方发现了https://facebook.github.io/react/docs/clone-with-props.html,相当不认同他开头的那句,这不是最常用的场景嘛
In rare situations, you may want to create a copy of a React element
当然这时候我还没用 Redux,Redux,Redux,重要的事情说三遍,所以我传了个setTitle的回调函数过去,在children组件的componentDidMount调用setTitle设置header的title,此时对React略有失望,尽管用javascript来代替html——相比较其他拼命加自定义属性来扩展html标签的语义——的思路是创新的,但也正是以组件为单位的思路导致了这种丑陋的layout控制方法,大致的路由设计如下,
Layout组件的实现如下,
const Layout = React.createClass({ ... ... setTitle: function(title){ this.setState({title:title}); }
render:function(){
let childrenWithProps = React.Children.map(this.props.children, (child) => {
return React.cloneElement(child, { setTitle: this.setTitle.bind(this) });
});
return (
)
}
});

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.


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