【react】慕课网视频学习笔记
1.JSX：语法糖，对语言的功能并没有影响，但更方便程序员使用，增强可读性。
2.jsFiddle：前端在线调试工具
3.为什么要把this额外声明成_self变量，因为window.setTimeout中的函数内部this指向的是global对象，所以需要在之前保存this变量。
也可以利用apply、call、bind修改this指向。
var Hello = React.createClass({
getInitialState: function () {
return {
opacity: 1.0
};
},
componentDidMount: function () {
this.timer = setInterval(function () {
var opacity = this.state.opacity;
opacity -= .05;
if (opacity < 0.1) {
opacity = 1.0;
}
this.setState({
opacity: opacity
});
}.bind(this), 100);
},
render: function () {
return (
<div style={{opacity: this.state.opacity}}>
Hello {this.props.name}
</div>
);
}
});
ReactDOM.render(
<Hello name="world"/>,
document.body
);4.实现按钮、输入框的联动
ref属性，找DOM节点时，用refs
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>菜鸟教程 React 实例</title>
<script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
<script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
<script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
</head>
<body>
<div ></div>
<script type="text/babel">
var TestClickComponent = React.createClass({
handleClick:function(event){
var tipE = ReactDOM.findDOMNode(this.refs.tip);
if(tipE.style.display === "none"){
tipE.style.display = "inline";
}else{
tipE.style.display = "none";
}
event.stopPropagation();
event.preventDefault();
},
render:function(){
return (
<div>
<button onClick={this.handleClick}>显示|隐藏</button><span ref="tip">测试点击</span>
</div>
);
}
});
var TestInputComponent = React.createClass({
getInitialState:function(){
return {
inputContent : ""
}
},
handletextInput:function(event){
this.setState({
inputContent:event.target.value
});
},
render:function(){
return (
<div>
<input type="text" onChange={this.handletextInput} /><span>{this.state.inputContent}</span>
</div>
);
}
});
ReactDOM.render(
<div>
<TestClickComponent />
<TestInputComponent />
</div>
,document.getElementById("container"))
</script>
</body>
</html>5.父组件、子组件之间的值传递