<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<p id="p0">这里是段落0</p>
<p id="p1">这里是段落1</p>
<p id="p2">这里是段落2</p>
<p id="p3">这里是段落3</p>
<p id="p4">这里是段落4</p>
<p id="p5">这里是段落5</p>
<p id="p6">这里是段落6</p>
<script>
//在字符串中查找字符串
var message="hello world! hello";
var str=message.indexOf("hello");
document.getElementById("p0").innerHTML=str;
//lastindexOf()
document.getElementById("p1").innerHTML=message.lastIndexOf("hello");
//替换字符串
var str2=message.replace("world","hello1");
document.getElementById("p2").innerHTML=str2;
//match匹配字符串,如果匹配到则返回该字符串
var x=message.match("world");
document.getElementById("p3").innerHTML=x;
</script>
</body>
</html>
