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Question

js如何获取文本域中某个字母的数量
举个例子来说，
我在文本框域1中输入：12345,2345,3456,5678,
在文本框域2中输入：22345,22345,23456,25678,
怎么来获得逗号的数量。 判断2个文本域的逗号是否相等 我想用这个功能做下验证  请教各位了· 不甚感激！

Answer 1

var temp1="12345,2345,3456,5678,".split(',');
var temp2="22345,22345,23456,25678,".split(',');alert(temp1.length==temp2.length);

Answer 2

var i=0,j=0;
var a={};
var temp1="12345,2345,3456,5678,";
var temp2="22345,22345,23456,25678,";
while((a=/,/g.exec(temp1))!=null)
{i++;}
while((a=/,/g.exec(temp2))!=null)
{j++;}
alert("temp1中逗号数："+i+"\n"+"temp2中逗号数："+j);

Answer 3

var temp1="12345,2345,3456,5678,";
var temp2="22345,22345,23456,25678,";
alert(temp1.match(/,/g).length);
alert(temp2.match(/,/g).length);

Answer 4

var temp1="12345,2345,3456,5678,".lastIndexOf(",");
var temp2="22345,22345,23456,25678,".lastIndexOf(',');
通过lastIndexOf取得最后一个","的下标

Answer 5

楼上的不对吧，lastIndexOf是取得索引值啊

Answer 6

var temp1="12345,2345,3456,5678,";
var temp2="22345,22345,23456,25678,";
var len1 = temp1.length - temp1.replace(",", "").length;
var len2 = temp2.length - temp2.replace(",", "").length;