var angelweb="我,你,ta,";
var re=/[,,]/g;
if(re.test(angelweb)){
var n=angelweb.match(re).length;
alert("字符串中包含"+n+"个逗号!");
}
var angelweb="我,你,ta,";
var re=/[,,]/g;
if(re.test(angelweb)){
var n=angelweb.match(re).length;
alert("字符串中包含"+n+"个逗号!");
}