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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>
react - lazyfighter.com
</title>
<link href="atom.xml" rel="alternate" title="lazyfighter.com" type="application/atom+xml">
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function before_search(){
var searchVal = 'site: ' + document.getElementById('search_input').value;
document.getElementById('search_q').value = searchVal;
return true;
}
</script>
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<div class="article">
<a class="clearlink" href="15383728323545.html">
<h1>state 属性</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var LikeButton = React.createClass({
getInitialState: function() {
return {liked: false};
},
getDefaultValue: function()
handleClick: function(event) {
this.setState({liked: !this.state.liked});
},
render: function() {
var text = this.state.liked ? 'like' : 'haven\'t liked';
return (
<p onClick={this.handleClick}>
You {text} this. Click to toggle.
</p>
);
}
});
ReactDOM.render(
<LikeButton />,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>react中认为一个组件即为一个整个state，getInitialState用来初始化state属性，this.setState()用来重新设置state属性，同时组件也会被从新进行渲染。</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383724150347.html">
<h1>组件寻找</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var MyComponent = React.createClass({
handleClick: function() {
this.refs.myTextInput.focus();
},
render: function() {
return (
<div>
<input type="text" ref="myTextInput" />
<input type="button" value="Focus the text input" onClick={this.handleClick} />
</div>
);
}
});
ReactDOM.render(
<MyComponent />,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>react提供属性this.refs用来寻找dom中的组件，但是组件同时要有ref属性</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383722422081.html">
<h1>属性默认值</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-javascript">var MyTitle = React.createClass({
getDefaultProps : function () {
return {
title : 'Hello World'
};
},
render: function() {
return <h1> {this.props.title} </h1>;
}
});
ReactDOM.render(
<MyTitle />,
document.getElementById('example')
);
</code></pre>
<h2 id="toc_0">解析</h2>
<p>react 在创建组件类的时候提供方法getDefaultProps来提供默认的属性初始化值。</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383717462675.html">
<h1>PropTypes 属性</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var data = 123;
var MyTitle = React.createClass({
propTypes: {
title: React.PropTypes.string.isRequired,
},
render: function() {
return <h1> {this.props.title} </h1>;
}
});
ReactDOM.render(
<MyTitle title={data} />,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>react compent有变量prop用来存储用户输入的变量，react特别提供PropTypes用来检测用户的输入参数校验</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383714092747.html">
<h1>组件的之间的继承关系</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var NotesList = React.createClass({
render: function() {
return (
<ol>
{
React.Children.map(this.props.children, function (child) {
return <li>{child}</li>;
})
}
</ol>
);
}
});
ReactDOM.render(
<NotesList>
<span>hello</span>
<span>world</span>
</NotesList>,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>Please be mindful that the value of this.props.children has three possibilities. If the component has no children node, the value is undefined; If single children node, an object; If multiple children nodes, an array. You should be careful to handle it.</p>
<p><strong>注意：</strong> 请注意this.props.children如果该组件没有子组件的话那么该属性的值为undefined，如果为一个children则返回object，如果含有多个children那么返回一个数组，请注意处理方式。</p>
<p>react提供工具类React.Children用来进行处理该属性，直接进行遍历即可，不用在考虑这几种情况。</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383709434642.html">
<h1>组件</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var HelloMessage = React.createClass({
render: function() {
return <h1>Hello {this.props.name}</h1>;
}
});
ReactDOM.render(
<HelloMessage name="John" />,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>React.createClass 用来创建一个组件类，需要实现render方法，返回一个组件类，我们不需要进行new进行创建类，直接使用即可，组件有可能会有属性，我们可以使用this.props进行属性的使用，在使用的过程中可直接使用属性进行赋值。</p>
<p><strong>注意</strong> 组件名称的第一个字母需要大写，否则react会报错</p>
<pre><code class="language-markup">// wrong
var HelloMessage = React.createClass({
render: function() {
return <h1>
Hello {this.props.name}
</h1><p>
some text
</p>;
}
});
// correct
var HelloMessage = React.createClass({
render: function() {
return <div>
<h1>Hello {this.props.name}</h1>
<p>some text</p>
</div>;
}
});
</code></pre>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383708631413.html">
<h1>数组直接进行渲染</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var arr = [
<h1 key="1">Hello world!</h1>,
<h2 key="2">React is awesome</h2>,
];
ReactDOM.render(
<div>{arr}</div>,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">解析</h2>
<p>看到上面的代码，是直接将数组内的东西直接进行合并渲染</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
<span class="posted-in"><a href='react.html'>react</a></span>
</div>
<div class="more-right right">
<span class="comments">
</span>
</div>
</div>
</div><!-- article -->
<div class="article">
<a class="clearlink" href="15383706359714.html">
<h1>数组Map方法</h1>
<div class="a-content">
<div class="a-content-text">
<pre><code class="language-markup"><!DOCTYPE html>
<html>
<head>
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var names = ['Alice', 'Emily', 'Kate'];
ReactDOM.render(
<div>
{
names.map(function (name, index) {
return <div key={index}>Hello, {name}!</div>
})
}
</div>,
document.getElementById('example')
);
</script>
</body>
</html>
</code></pre>
<h2 id="toc_0">map解析</h2>
<p>个人感觉类似java中的数组流的map方法，遍历整个数组并对数组中的内容进行转换，看上面的代码是将原数组中所有人的名字，进行转换然后转换为div</p>
</div>
</div>
</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2018/10/1</span>
<span>posted in </span>
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