脚本检查浏览器及其版本

function getBrowserInfo() {
var agent = navigator.userAgent.toLowerCase();

var regStr_ie = /msie +;/gi;
//var regStr_ie = /msie [\d.]+;/gi;
var regStr_ff = /firefox+/gi;
//var regStr_ff = /firefox\/[\d.]+/gi;
var regStr_chrome = /chrome+/gi;
//var regStr_chrome = /chrome\/[\d.]+/gi;
var regStr_saf = /safari+/gi;
//var regStr_saf = /safari\/[\d.]+/gi;

var obj = '';
//IE
if (agent.indexOf("msie") > 0) {
obj =  agent.match(regStr_ie);
}

//firefox
if (agent.indexOf("firefox") > 0) {
obj =  agent.match(regStr_ff);
}

//Chrome
if (agent.indexOf("chrome") > 0) {
obj =  agent.match(regStr_chrome);
}

//Safari
if (agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0) {
obj =  agent.match(regStr_saf);
}

}