文本处理

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// "\n" => "<br />"
function return2BR(text) 
{
    return (text || '').replace(/\n/g, "<br />");
}

常用计算

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// 去除 URL 中的协议字段
function urlForRelativeScheme(url)
{
    if(url === undefined) return undefined;
    return url.replace(/^.*?:\/\//, '//');
}

// 根据生日计算年龄
function getAge(dateStr)
{
    var today = new Date();
    var birthday = new Date(dateStr);
    var age = today.getFullYear() - birthday.getFullYear();
    var m = today.getMonth() - birthday.getMonth();
    if (m < 0 || (m === 0 && today.getDate() < birthday.getDate()))
    {
        --age;
    }
    return age;
}

// 获取 query 参数字典
function getQueryParams()
{
    var arr = decodeURI(window.location.search.substr(1)).split("&");
    var params = {};
    for (var i = 0; i < arr.length; ++i)
    {
        var tmp_arr = arr[i].split("=");
        params[tmp_arr[0]] = tmp_arr[1];
    }
    return params;
}

// 根据字典生成 query 字符串
function createQueryString(params)
{
    var arr = [];
    for(var key in params)
    {
        if(key && params.hasOwnProperty(key))
        {
            arr.push(key + '=' + params[key]);
        }
    }
    return arr.join('&');
}

// 追加参数到 query 并重定向
function switchLocation(targetParams)
{
    var params = getQueryParams();
    params = $.extend(params, targetParams);
    var search = createQueryString(params);
    var l = window.location;
    window.location.href = l.protocol + "//" + l.hostname + (l.port ? ':' + l.port: '') + l.pathname + '?' + search;
}