腳本檢查瀏覽器及其版本

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);
    }

}