React中的for循环
记得要绑定key!
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="./js/react.development.js"></script>
<script src="./js/react-dom.development.js"></script>
<script src="./js/babel.min.js"></script>
<title>例子2</title>
</head>
<body>
<div id="root1"></div>
<div id="root2"></div>
<div id="root3"></div>
</body>
<script type="text/babel">
//继承实例
window.onload = () => {
var arr = ["a", "b", "d", "e", "f"];
//第一种写法 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
ReactDOM.render(
<div>
{
arr.map((item, index) => {
return <div key={index}>{item}</div>
})
}
</div>,
document.getElementById("root1")
)
//第二种写法 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
var str = arr.map((item, index) => {
return <div key={index}>{item}</div>
})
ReactDOM.render(
<div>
{str}
</div>,
document.getElementById("root2")
)
//第三种写法 我们应该是最熟悉这种写法
var str=[];
for(let i=0;i<arr.length;i++){
str.push(<div key={i}>{arr[i]}</div>)
}
ReactDOM.render(
str,
document.getElementById("root3")
)
}
</script>
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