/**
 * 获取URL参数
 * @param  {[string]} name [description]
 * @param  {[string]} url  [description]
 * @return {[string]}      [description]
 */
function getQuery(name, url) {
    //参数：变量名，url为空则表从当前页面的url中取
    var u = arguments[1] || window.location.search,
            reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"),
            r = u.substr(u.indexOf("\?") + 1).match(reg);
    return r != null ? r[2] : "";
}

/**
 * 事件绑定
 */
 var EventUtil = {
        addHandler: function( element, type, handler ) {
            if ( element.addEventListener ) {
                element.addEventListener ( type, handler, false );
            } else if ( element.attachEvent ) {
                element.attachEvent ( "on" + type, handler );
            } else {
                element["on" + type] = handler;
            }
        },

        getEvent: function ( event ) {
            return event ? event : window.event;
        },

        getTarget: function ( event ) {
            return event.target || event.srcElement;
        },

        preventDefault: function ( event ) {
            if ( event.preventDefault ) {
                event.preventDefault();
            } else {
                event.returnValue = false;
            }
        },

        removeHandler: function( element, type, handler ) {
            if ( element.removeEventListener ) {
                element.removeEventListener ( type, handler, false );
            } else if ( element.detachEvent ) {
                element.detachEvent ( "on" + type, handler );
            } else {
                element["on" + type] = null;
            }
        },

        stopPropagation: function ( event ) {
            if ( event.stopPropagation ) {
                event.stopPropagation();
            } else {
                event.cancelBubble = true;
            }
        }

    };

/**
 * 对象转为URL参数
 * @param  {[type]} param [description]
 * @param  {[type]} key   [description]
 * @return {[type]}       [description]
 */
var parseParam = function(param, key) {
    var paramStr = "";
    if (param instanceof String || param instanceof Number || param instanceof Boolean) {
        paramStr += "&" + key + "=" + encodeURIComponent(param);
    } else {
        $.each(param, function(i) {
            var k = key == null ? i : key + (param instanceof Array ? "[" + i + "]" : "." + i);
            paramStr += '&' + parseParam(this, k);
        });
    }
    return paramStr.substr(1);
};

//调用：
var obj = {
    name: 'tom',
    'class': {
        className: 'class1'
    },
    classMates: [{
        name: 'lily'
    }]
};
parseParam(obj);
结果： "name=tom&class.className=class1&classMates[0].name=lily"
parseParam(obj, 'stu');
结果： "stu.name=tom&stu.class.className=class1&stu.classMates[0].name=lily"

//替换url中指定参数
var replaceParam = function(param, value, url, forceReplace) {
    url = url || location.href;
    var reg = new RegExp("([\\?&]" + param + "=)[^&#]*"), hash = location.hash;
    if (!url.match(reg)) {
        if (!!hash) {
            url = url.substring(0, url.indexOf('#'));
        }
        return ((url.indexOf("?") == -1) ? (url + "?" + param + "=" + value) : (url + "&" + param +
            "=" + value)) + hash;
    }
    if (forceReplace) {
        return url.replace(reg, "$1" + value);
    }
    return url;
};

//文字截断
function truncation() {
    if (window.CSS && window.CSS.supports && window.CSS.supports('display', '-webkit-box')) {
        return;
    }

    $('div span').each(function(index, el) {
        var line = 0,
            step, suffix = "...",
            clientRects, isLimit = false,
            string = this.innerHTML,
            limit = 2;  //限制行数

        clientRects = this.getClientRects();
        line = clientRects.length;

        if (line <= limit) {
            return;
        }

        while (line > limit) {
            isLimit = true;
            step = line > (limit + 1) ? 7 : 1;
            string = string.substr(0, string.length - step);
            this.innerHTML = string + suffix;
            clientRects = this.getClientRects();
            line = clientRects.length;
        }
        if (isLimit) {
            string += suffix;
        }
        $(this).html(string);
    });
}

/*
 * Schedule an invocation or invocations of f() in the future.
 * Wait start milliseconds, then call f() every interval milliseconds,
 * stopping after a total of start+end milliseconds.
 * If interval is specified but end is omitted, then never stop invoking f.
 * If interval and end are omitted, then just invoke f once after start ms.
 * If only f is specified, behave as if start was 0.
 * Note that the call to invoke() does not block: it returns right away.
 */
function invoke(f, start, interval, end) {
    if (!start) start = 0; // Default to 0 ms
    if (arguments.length <= 2) // Single-invocation case
        setTimeout(f, start); // Single invocation after start ms.
    else { // Multiple invocation case
        setTimeout(repeat, start); // Repetitions begin in start ms
        function repeat() { // Invoked by the timeout above
            var h = setInterval(f, interval); // Invoke f every interval ms.
            // And stop invoking after end ms, if end is defined
            if (end) setTimeout(function() {
                clearInterval(h);
            }, end);
        }
    }
}

/*
 * This function parses ampersand-separated name=value argument pairs from
 * the query string of the URL. It stores the name=value pairs in
 * properties of an object and returns that object. Use it like this:
 *
 * var args = urlArgs(); // Parse args from URL
 * var q = args.q || ""; // Use argument, if defined, or a default value
 * var n = args.n ? parseInt(args.n) : 10;
 */
function urlArgs() {
    var args = {}; // Start with an empty object
    var query = location.search.substring(1); // Get query string, minus '?'
    var pairs = query.split("&"); // Split at ampersands
    for (var i = 0; i < pairs.length; i++) { // For each fragment
        var pos = pairs[i].indexOf('='); // Look for "name=value"
        if (pos == -1) continue; // If not found, skip it
        var name = pairs[i].substring(0, pos); // Extract the name
        var value = pairs[i].substring(pos + 1); // Extract the value
        value = decodeURIComponent(value); // Decode the value
        args[name] = value; // Store as a property
    }
    return args; // Return the parsed arguments
}

location = "http://www.oreilly.com"; // Go buy some books!
location = "page2.html"; // Load the next page
/**
 * #top不存在时，浏览器跳到文档开始处
 */
location = "#top"; // Jump to the top of the document
location.search = "?page=" + (pagenum+1); // load the next page

history.back();
history.forward();
history.go(0);
history.go(-2);

/*@cc_on
    @if (@_jscript)
        // This code is inside a JS comment but is executed in IE.
        alert("In IE");
    @end
@*/


/*@cc_on
    @if (@_jscript)
        // This code is inside a conditional comment, which is also a
        // regular JavaScript comment. IE runs it but other browsers ignore it.
        alert('You are using Internet Explorer);
    @else*/
        // This code is no longer inside a JavaScript comment, but is still
        // inside the IE conditional comment. This means that all browsers
        // except IE will run this code.
        alert('You are not using Internet Explorer');
    /*@end
@*/

// No matter how it is capitalized, replace it with the correct capitalization
text.replace(/javascript/gi, "JavaScript");