JavaScript 常用的小功能集合

function getExplorer(){  
　　 var browser = "";
    var explorer = window.navigator.userAgent;    
    if (explorer.indexOf("MSIE") >= 0) {    // ie10及以下
        var b_version = navigator.appVersion;
        var version = b_version.split(";");
        version = version[1].replace(/[ ]/g, "");
        version = version.split(‘MSIE‘)[1];
        browser = ‘IE:‘ + version;
    } else if (explorer.indexOf("Firefox") >= 0) {    // Firefox
        browser = ‘Firefox‘;
    } else if (explorer.indexOf("Chrome") >= 0) {    // Chrome
        browser = ‘Chrome‘;
    } else if (explorer.indexOf("Opera") >= 0) {    // Opera
        browser = ‘Opera‘;
    } else if (explorer.indexOf("Safari") >= 0) {    // Safari
        browser = ‘Safari‘;
    } else if (explorer.indexOf("Trident/7.0") >= 0) {    // IE11
        browser = ‘IE:10.0以上‘;
    }
    return browser;
}  

function click() {
    if(event.button == 2 || event.button == 3) {
        alert("禁止鼠标右键操作");
    }
}
document.onmousedown = click;    

function closeWin() {
    window.close();
    return false;
}

function printWin() {
    window.print();
}

function getQueryString(name) { 
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i"); 
    var r = window.location.search.substr(1).match(reg); 
    if (r != null) {
        return unescape(r[2]); 
    }
    return null; 
}