<!DOCTYPE html>
<html>
<head>
<title>练习</title>
</head>
<body>
<p id="p1">Please locate where 'locate' occurs!.</p>
<html>
<head>
<title>练习</title>
</head>
<body>
<p id="p1">Please locate where 'locate' occurs!.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<p id="zz"></p>
<script>
function myFunction() {
var n=0;
var pos=0;
var m=0;
var str = document.getElementById("p1").innerHTML;
var s1=str;
var s2 = str;
while(m!=str.lastIndexOf("locate"))
{
<p id="zz"></p>
<script>
function myFunction() {
var n=0;
var pos=0;
var m=0;
var str = document.getElementById("p1").innerHTML;
var s1=str;
var s2 = str;
while(m!=str.lastIndexOf("locate"))
{
pos = s1.indexof("locate");
s1=s2.substr(pos+6);
n=n+1;
m=pos+m;
}
document.getElementById("demo").innerHTML = n;
document.getElementById("zz").innerHTML = str;
}
</script>
s1=s2.substr(pos+6);
n=n+1;
m=pos+m;
}
document.getElementById("demo").innerHTML = n;
document.getElementById("zz").innerHTML = str;
}
</script>
</body>
</html>
</html>