/*等比例缩放图片*/
function autoresizeimage(maxwidth, maxheight, objimg) {
    var img = new image();
    img.src = objimg.src;
    var hratio;
    var wratio;
    var ratio = 1;
    var w = img.width;
    var h = img.height;
    wratio = maxwidth / w;
    hratio = maxheight / h;
    if (maxwidth == 0 && maxheight == 0) {
        ratio = 1;
    } else if (maxwidth == 0) {
        //
        if (hratio < 1)
            ratio = hratio;
    } else if (maxheight == 0) {
        if (wratio < 1)
            ratio = wratio;
    } else if (wratio < 1 || hratio < 1) {
        ratio = (wratio <= hratio ? wratio : hratio);
    }
    if (ratio < 1) {
        w = w * ratio;
        h = h * ratio;
    }
    objimg.height = h;
    objimg.width = w;
}
/*点击更换验证码*/
$(function() {
    var verifyimg = $(".verifyimg").attr("src");
    $(".reloadverify").click(function() {
        if (verifyimg.indexof('?') > 0) {
            $(".verifyimg").attr("src", verifyimg + '&random=' + math.random());
        } else {
            $(".verifyimg").attr("src", verifyimg.replace(/\?.*$/, '') + '?' + math.random());
        }
    });
})

//加入收藏
function addfavorite(surl, stitle) {
    surl = encodeuri(surl);
    try {
        window.external.addfavorite(surl, stitle);
    } catch (e) {
        try {
            window.sidebar.addpanel(stitle, surl, "");
        } catch (e) {
            alert("加入收藏失败，请使用ctrl+d进行添加,或手动在浏览器里进行设置.");
        }
    }
}

//设为首页
function sethome(url) {
    if (document.all) {
        document.body.style.behavior = 'url(#default#homepage)';
        document.body.sethomepage(url);
    } else {
        alert("您好,您的浏览器不支持自动设置页面为首页功能,请您手动在浏览器里设置该页面为首页!");
    }
}
//判断变量是否为空
function isnull(data) {
    var result = (data == "" || data == undefined || data == null) ? true : false;
    return result;
}

//获取url参数

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

/*
 * url 目标url
 * arg 需要替换的参数名称
 * arg_val 替换后的参数的值
 * return url 参数替换后的url
 */
function changeurlarg(url, arg, arg_val) {
    var pattern = arg + '=([^&]*)';
    var replacetext = arg + '=' + arg_val;
    if (url.match(pattern)) {
        var tmp = '/(' + arg + '=)([^&]*)/gi';
        tmp = url.replace(eval(tmp), replacetext);
        return tmp;
    } else {
        if (url.match('[\?]')) {
            return url + '&' + replacetext;
        } else {
            return url + '?' + replacetext;
        }
    }
    return url + '\n' + arg + '\n' + arg_val;
}
/*手机跳转*/
function mobile_device_detect(url) {
    var thisos = navigator.platform;
    var os = new array("iphone","ipod","ipad","android","nokia","symbianos","symbian","windows phone","phone","linux armv71","maui","untrusted/1.0","windows ce","blackberry","iemobile");
    for (var i = 0; i < os.length; i++) {
        if (thisos.match(os[i])) {
            window.location = url;
        }

    }
    //因为相当部分的手机系统不知道信息,这里是做临时性特殊辨认
    if (navigator.platform.indexof('ipad') != -1) {
        window.location = url;
    }
    //做这一部分是因为android手机的内核也是linux
    //但是navigator.platform显示信息不尽相同情况繁多,因此从浏览器下手，即用navigator.appversion信息做判断
    var check = navigator.appversion;
    if (check.match(/linux/i)) {
        //x11是uc浏览器的平台 ，如果有其他特殊浏览器也可以附加上条件
        if (check.match(/mobile/i) || check.match(/x11/i)) {
            window.location = url;
        }
    }
    //类in_array函数
    array.prototype.in_array = function(e) {
        for (i = 0; i < this.length; i++) {
            if (this[i] == e)
                return true;
        }
        return false;
    }
}
// 设为首页
function sethome(obj, vrl) {
    try {
        obj.style.behavior = 'url(#default#homepage)';
        obj.sethomepage(vrl);
    } catch (e) {
        if (window.netscape) {
            try {
                netscape.security.privilegemanager.enableprivilege("universalxpconnect");
            } catch (e) {
                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");
            }
            var prefs = components.classes['@mozilla.org/preferences-service;1'].getservice(components.interfaces.nsiprefbranch);
            prefs.setcharpref('browser.startup.homepage', vrl);
        } else {
            alert("您的浏览器不支持，请按照下面步骤操作：1.打开浏览器设置。2.点击设置网页。3.输入：" + vrl + "点击确定。");
        }
    }
}
// 加入收藏 兼容360和ie6 
function shoucang(stitle, surl) {
    try {
        window.external.addfavorite(surl, stitle);
    } catch (e) {
        try {
            window.sidebar.addpanel(stitle, surl, "");
        } catch (e) {
            alert("加入收藏失败，请使用ctrl+d进行添加");
        }
    }
}