获取字符串出现的次数
<!DOCTYPE html>
<html>
<body>
<p id="p1">start stop speed start speed velociting start</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "start stop speed start speed velociting start";
var pos = str.indexOf("start");
var time = 0;
var sp =str.indexOf("start") ;
while(sp != -1)
{
sp = str.indexOf("start",sp);
if(sp !=-1)
{time++;
sp++;
}
}
document.getElementById("demo").innerHTML = pos;
document.getElementById("demo").innerHTML =time;
}
<p>Hello world!</p>
var x=document.getElementsByTagName("p");
document.getElementById("p1").innerHTML='The ....is'+x[0].innerHTML;
</script>
</body>
</html>
