js文件强制刷新/更新

http协议状态码：https://blog.csdn.net/phpfenghuo/article/details/18599029

1:利用Last-Modified和ETag标签

参考：https://blog.csdn.net/tenfyguo/article/details/5892582

转自：http://www.cnblogs.com/volnet/archive/2012/11/02/2752019.html

var httpCacheUtil = {
            createXHR: function () {
                if (typeof XMLHttpRequest != "undefined") {
                    return new XMLHttpRequest();
                }
                else if (typeof ActiveXObject != "undefined") {
                    if (typeof arguments.callee.activeXString != "string") {
                        var versions = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0", "MSXML2.XMLHttp"];
                        for (var i = 0, len = versions.length; i < len; ++i) {
                            try {
                                var xhr = new ActiveXObject(versions[i]);
                                arguments.callee.activeXString = versions[i];
                                return xhr;
                            }
                            catch (ex) {
                                // pass
                            }
                        }
                    }
                    return new ActiveXObject(arguments.callee.activeXString);
                }
                else {
                    throw new Error("No XHR object available");
                }
            },
            update: function(url){
                try {
                    var success = function(responseText) {
                    
                    };
                    var error = function(errorStatus) {
                    
                    };
                    var xhr = httpCacheUtil.createXHR();
                    if(typeof xhr != "undefined" && xhr != null) {
                        xhr.onreadystatechange = function (event) {
                            if (xhr.readyState == 4) {
                                if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304) {
                                    if (typeof success === "function")
                                        success(xhr.responseText);
                                }
                                else {
                                    if (typeof error === "function")
                                        error(xhr.status);
                                }
                            }
                        };
                        xhr.open("GET", url, false);
                        xhr.setRequestHeader("If-None-Match","\"22426f327b8cd1:0\"");
                        xhr.setRequestHeader("If-Modified-Since", "Sat, 31 Dec 2011 02:51:00 GMT");
                        xhr.send(null);
                    }
                }
                catch(e){
                    // throw no exception
                }
            }
        };
        httpCacheUtil.update("http://volnet.cnblogs.com/Scripts/demo1.js");
        httpCacheUtil.update("http://volnet.cnblogs.com/Scripts/demo2.js");

2:直接在链接后面加上版本号

js文件强制刷新/更新

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