在段落中使用javascript计数字符串

如何计算给定段落中的字符串

var s = "sharepoint 2010 is good.sharepoint 2010 is nice.sharepoint 2010 is better then sharepoint 2007";
var re = /sharepoint 2010/g;
var c;
for(c = 0; re.exec(s); ++c );
alert(c);

例如：- 我的字符串是“sharepoint 2010”

我的段落是：-sharepoint 2010很好。sharepoint 2010很好。sharepoint 2010比sharepoint 2007更好

这里的计数是：-3，因为sharepoint 2010重复3次

我的问题是如何使用javascript将字符串与段落进行比较

var s = "sharepoint 2010 is good.sharepoint 2010 is nice.sharepoint 2010 is better then sharepoint 2007";
var re = /sharepoint 2010/g;
var c;
for(c = 0; re.exec(s); ++c );
alert(c);

演示：

试试这个：

var str = "sharepoint 2010 is good.sharepoint 2010 is nice.Sharepoint 2010 is better then sharepoint 2007."; 
var patt1=/sharepoint 2010/gi;
document.write(str.match(patt1).length); //Prints 3

只是为了好玩：

<p id="thePara">sharepoint 2010 is good.sharepoint 2010 is nice.sharepoint 2010 is better then sharepoint 2007.</p>

var p = document.getElementById("thePara");
var split = p.innerHTML.split("sharepoint 2010");
alert("length is: " + split[split.length - 1] === "sharepoint 2010" ? split.length : split.length - 1);

sharepoint 2010很好。sharepoint 2010很好。sharepoint 2010比sharepoint 2007好

var p=document.getElementById（“thePara”）； var split=p.innerHTML.split（“sharepoint 2010”）； 警报（“长度为：”+split[split.length-1]=“sharepoint 2010”？split.length:split.length-1）； 演示：