<!DOCTYPE html>
<html><head> <title>查找</title> <meta charset="utf-8"></head><body><p>吃葡萄不吐葡萄皮，不吃葡萄倒吐葡萄皮</p>
<button οnclick="find()">点击查看"葡萄"这个词出现的次数</button><p id="demo"></p>
<script>
function find(){ var str="吃葡萄不吐葡萄皮，不吃葡萄倒吐葡萄皮"var y="葡萄";var count=0;var index=0;for(z=0;z<=str.length;z++) { if(str.indexOf(y,index)!=-1) { index=str.indexOf(y,index)+y.length; count=count+1; } }document.getElementById("demo").innerHTML =count;}</script></body>
</html>