分享一个常用的javascript静态类

废话不多说，直接奉上代码，知道干啥用的小伙伴直接带走吧。

util=function(){

    return {

        $:function(id){

            return document.getElementById(id);

        },

        trim:function(str){

            return str.replace(/(^\s+)|(\s+$)/g, "");

        },

        len:function(str){   

            return str.replace(/[^\x00-\xff]/g,'**').length;   

        },

        format:function(str){

            var arg = arguments;

            return str.replace(/\{(\d+)\}/g, function(m, i){

                return arg[parseInt(i)+1];

            });

        },

        each:function(object, callback, args){

            var name, i = 0, length = object.length;

            if ( args ) {

                if ( length === undefined ) {

                    for ( name in object )

                        if ( callback.apply( object[ name ], args ) === false )

                            break;

                } else

                    for ( ; i < length; )

                        if ( callback.apply( object[ i++ ], args ) === false )

                            break;

            } else {

                if ( length === undefined ) {

                    for ( name in object )

                        if ( callback.call( object[ name ], name, object[ name ] ) === false )

                            break;

                } else

                    for ( var value = object[0];

                        i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}

            }

        },

        setCookie:function(name,value,hours,path,domain){

            var str=new String();

            var nextTime=new Date();

            nextTime.setHours(nextTime.getHours()+hours);

            str=name+"="+escape(value);

            if(hours)

                str+=";expires="+nextTime.toGMTString();

            if(path)

                str+=";path="+path;

            if(domain)

                str+=";domain="+domain;

            document.cookie=str;

        },

        getCookie:function(name){

            var rs=new RegExp("(^|)"+name+"=([^;]*)(;|$)","gi").exec(document.cookie),tmp;

            if(tmp=rs)

                return unescape(tmp[2]);

            return null;

        },

        delCookie:function(name){

            document.cookie = name + "=-1" + "; expires=Fri, 31 Dec 1999 23:59:59 GMT;";

        },

        /**

        *url String

        *parms String

        *method String default value "get"

        *asy Boolean defalut value true

        *success Function(http_request.responseText)

        **/

        ajax:function(config){

            var url=config.url,

                parms=(config.parms?config.parms:"") + "&t="+new Date().getTime(),

                method=config.method||"get",

                asy=true;

            var http_request=null;

            if(method.toLowerCase()=="get"){

                url=url+"?"+parms;

                parms=null;

            }

            //开始初始化XMLHttpRequest对象

            if(window.XMLHttpRequest) { //Mozilla 浏览器

                http_request = new XMLHttpRequest();

                if (http_request.overrideMimeType) {//设置MiME类别

                    http_request.overrideMimeType("text/xml");

                }

            } else if (window.ActiveXObject) { // IE浏览器

                try {

                    http_request = new ActiveXObject("Msxml2.XMLHTTP");

                } catch (e) {

                    try {                

                        http_request = new ActiveXObject("Microsoft.XMLHTTP");

                    } catch (e) {}

                }

            }

            if(!http_request) { // 异常，创建对象实例失败

                throw new Error("不能创建XMLHttpRequest对象实例.");

                return null;

            }

            http_request.open(method,url,asy);

            http_request.onreadystatechange=function(){

                if (http_request.readyState == 4){

                    try{

                        if (http_request.status == 200){

                            config.success(http_request.responseText);

                        }

                    }catch(e){

                        throw new Error("数据读取失败.");

                    }

                }

            };

            if(method.toLowerCase()=="post"){

                http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

            }

            http_request.send(parms);

        }

    };

}();

是不是相当不错呢，反正我是很满意。