JavaScript常用方法记录

经常使用的 JS 方法，今天记下，以便以后查询

1.手机类型判断

var BrowserInfo = {    userAgent: navigator.userAgent.toLowerCase()    isAndroid: Boolean(navigator.userAgent.match(/android/ig)),    isIphone: Boolean(navigator.userAgent.match(/iphone|ipod/ig)),    isIpad: Boolean(navigator.userAgent.match(/ipad/ig)),    isWeixin: Boolean(navigator.userAgent.match(/MicroMessenger/ig)),}

2.返回字符串长度，汉子计数为2

    function strLength(str) {         var a = 0;         for (var i = 0; i < str.length; i++) {             if (str.charCodeAt(i) > 255)                 a += 2;//按照预期计数增加2             else                  a++;          }          return a;     }

3.获取url中的参数

function GetQueryStringRegExp(name,url) {    var reg = new RegExp("(^|\\?|&)" + name + "=([^&]*)(\\s|&|$)", "i");    if (reg.test(url))        return decodeURIComponent(RegExp.$2.replace(/\+/g, " "));         return "";}

4.js 绑定事件 适用于任何浏览器的元素绑定

function eventBind(obj, eventType, callBack) {        if (obj.addEventListener) {            obj.addEventListener(eventType, callBack, false);        }        else if (window.attachEvent) {            obj.attachEvent('on' + eventType, callBack);        }        else {            obj['on' + eventType] = callBack;        }    };eventBind(document, 'click', bodyClick);

5.获得当前浏览器JS的版本

function getjsversion(){    var n = navigator;    var u = n.userAgent;    var apn = n.appName;    var v = n.appVersion;    var ie = v.indexOf('MSIE ');    if (ie > 0){        apv = parseInt(i = v.substring(ie + 5));        if (apv > 3) {            apv = parseFloat(i);        }    } else {        apv = parseFloat(v);    }    var isie = (apn == 'Microsoft Internet Explorer');    var ismac = (u.indexOf('Mac') >= 0);    var javascriptVersion = "1.0";    if (String && String.prototype) {        javascriptVersion = '1.1';        if (javascriptVersion.match) {            javascriptVersion = '1.2';            var tm = new Date;            if (tm.setUTCDate) {                javascriptVersion = '1.3';                if (isie && ismac && apv >= 5) javascriptVersion = '1.4';                var pn = 0;                if (pn.toPrecision) {                    javascriptVersion = '1.5';                    a = new Array;                    if (a.forEach) {                        javascriptVersion = '1.6';                        i = 0;                        o = new Object;                        tcf = new Function('o', 'var e,i=0;try{i=new Iterator(o)}catch(e){}return i');                        i = tcf(o);                        if (i && i.next) {                            javascriptVersion = '1.7';                        }                    }                }            }        }    }    return javascriptVersion;}

6.获取当前点击事件的Object对象

function getEvent() {    if (document.all) {        return window.event; //如果是ie    }    func = getEvent.caller;    while (func != null) {        var arg0 = func.arguments[0];        if (arg0) {            if ((arg0.constructor == Event || arg0.constructor == MouseEvent)|| (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {                return arg0;            }        }        func = func.caller;    }    return null;};

7.字符串截取方法

getCharactersLen: function (charStr, cutCount) {        if (charStr == null || charStr == '') return '';        var totalCount = 0;        var newStr = '';        for (var i = 0; i < charStr.length; i++) {            var c = charStr.charCodeAt(i);            if (c < 255 && c > 0) {                totalCount++;            } else {                totalCount += 2;            }            if (totalCount >= cutCount) {                newStr += charStr.charAt(i);                break;            }            else {                newStr += charStr.charAt(i);            }        }        return newStr;    }

8.JS 弹出新窗口全屏

var tmp = window.open("about:blank", "", "fullscreen=1")                            tmp.moveTo(0, 0);                            tmp.resizeTo(screen.width + 20, screen.height);                            tmp.focus();                            tmp.location.href = 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html';var config_ = "left=0,top=0,width=" + (window.screen.Width) + ",height=" + (window.screen.Height);                            window.open('http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html', "winHanle", config_);//模拟form提交打开新页面var f = document.createElement("form");                            f.setAttribute('action', 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html');                            f.target = '_blank';                            document.body.appendChild(f);                            f.submit();

9.全选/全不选

function selectAll(objSelect) {
            if (objSelect.checked == true) {
                $("input[name='chkId']").attr("checked", true);
                $("input[name='chkAll']").attr("checked", true);
            }
            else if (objSelect.checked == false) {
                $("input[name='chkId']").attr("checked", false);
                $("input[name='chkAll']").attr("checked", false);
            }
        }

10.js 判断浏览器

判断是否是 IE 浏览器    if (document.all){         alert(”IE浏览器”);     }else{         alert(”非IE浏览器”);     }     if (!!window.ActiveXObject){         alert(”IE浏览器”);     }else{         alert(”非IE浏览器”);     } 判断是IE几var isIE=!!window.ActiveXObject; var isIE6=isIE&&!window.XMLHttpRequest; var isIE8=isIE&&!!document.documentMode; var isIE7=isIE&&!isIE6&&!isIE8; if (isIE){     if (isIE6){         alert(”ie6″);     }else if (isIE8){         alert(”ie8″);     }else if (isIE7){         alert(”ie7″);     } }

11.判断浏览器

function getOs() {    if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {        return "MSIE8";    }    else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {        return "MSIE6";    }    else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {        return "MSIE7";    }    else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {        return "Firefox";    }    if (navigator.userAgent.indexOf("Chrome") > 0) {        return "Chrome";    }    else {        return "Other";    }}

12.JS判断两个日期大小 适合 2012-09-09 与2012-9-9 两种格式的对比

//得到日期值并转化成日期格式，replace(/\-/g, "\/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了        function ValidateDate() {            var beginDate = $("#t_datestart").val();            var endDate = $("#t_dateend").val();            if (beginDate.length > 0 && endDate.length>0) {                var sDate = new Date(beginDate.replace(/\-/g, "\/"));                var eDate= new Date(endDate.replace(/\-/g, "\/"));                if (sDate > eDate) {                    alert('开始日期要小于结束日期');                    return false;                }            }        }

13 移除事件

this.moveBind = function (objId, eventType, callBack) {                var obj = document.getElementById(objId);                if (obj.removeEventListener) {                    obj.removeEventListener(eventType, callBack, false);                }                else if (window.detachEvent) {                    obj.detachEvent('on' + eventType, callBack);                }                else {                    obj['on' + eventType] = null;                }            }

14 回车提交

$("id").onkeypress = function (event) {    event = (event) ? event : ((window.event) ? window.event : "")    keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);    if (keyCode == 13) {        $("SubmitLogin").onclick();    }}

15 JS 执行计时器

timeStart = new Date().getTime();timesEnd = new Date().getTime();document.getElementById("time").innerHTML = timesEnd - timeStart;

16 JS 写Cookie

function setCookie(name, value, expires, path, domain) {    if (!expires) expires = -1;    if (!path) path = "/";    var d = "" + name + "=" + value;    var e;    if (expires < 0) {        e = "";    }    else if (expires == 0) {        var f = new Date(1970, 1, 1);        e = ";expires=" + f.toUTCString();    }    else {        var now = new Date();        var f = new Date(now.getTime() + expires * 1000);        e = ";expires=" + f.toUTCString();    }    var dm;    if (!domain) {        dm = "";    }    else {        dm = ";domain=" + domain;    }    document.cookie = name + "=" + value + ";path=" + path + e + dm;};

17 JS 读Cookie

function readCookie(name) {    var nameEQ = name + "=";    var ca = document.cookie.split(';');    for (var i = 0; i < ca.length; i++) {        var c = ca[i];        while (c.charAt(0) == ' ') c = c.substring(1, c.length);        if (c.indexOf(nameEQ) == 0) {            return decodeURIComponent(c.substring(nameEQ.length, c.length))        }    } return null}

18 Ajax 请求

C.ajax = function (args) {    var self = this;    this.options = {        type: 'GET',        async: true,        contentType: 'application/x-www-form-urlencoded',        url: 'about:blank',        data: null,        success: {},        error: {}    };    this.getXmlHttp = function () {        var xmlHttp;        try {            xmlhttp = new XMLHttpRequest();        }        catch (e) {            try {                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");            }            catch (e) {                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");            }        }        if (!xmlhttp) {            alert('您的浏览器不支持AJAX');            return false;        }        return xmlhttp;    };    this.send = function () {        C.each(self.options, function (key, val) {            self.options[key] = (args[key] == null) ? val : args[key];        });        var xmlHttp = new self.getXmlHttp();        if (self.options.type.toUpperCase() == 'GET') {            xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? '&' : '?') + self.options.data)), self.options.async);        }        else {            xmlHttp.open(self.options.type, self.options.url, self.options.async);            xmlHttp.setRequestHeader('Content-Length', self.options.data.length);        }        xmlHttp.setRequestHeader('Content-Type', self.options.contentType);        xmlHttp.onreadystatechange = function () {            if (xmlHttp.readyState == 4) {                if (xmlHttp.status == 200 || xmlHttp.status == 0) {                    if (typeof self.options.success == 'function') self.options.success(xmlHttp.responseText);                    xmlHttp = null;                }                else {                    if (typeof self.options.error == 'function') self.options.error('Server Status: ' + xmlHttp.status);                }            }        };        xmlHttp.send(self.options.type.toUpperCase() == 'POST' ? self.options.data.toString() : null);    };    this.send();};

18 JS StringBuilder 用法

function StringBuilder() {    this.strings = new Array;};StringBuilder.prototype.append = function (str) {    this.strings.push(str);};StringBuilder.prototype.toString = function () {    return this.strings.join('');};

19 JS 加载到顶部LoadJS

function loadJS (url, fn) {        var ss = document.getElementsByName('script'),            loaded = false;        for (var i = 0, len = ss.length; i < len; i++) {            if (ss[i].src && ss[i].getAttribute('src') == url) {                loaded = true;                break;            }        }        if (loaded) {            if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();            return false;        }        var s = document.createElement('script'),            b = false;        s.setAttribute('type', 'text/javascript');        s.setAttribute('src', url);        s.onload = s.onreadystatechange = function () {            if (!b && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {                b = true;                if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();            }        };        document.getElementsByTagName('head')[0].appendChild(s);    },    bind: function (objId, eventType, callBack) {  //适用于任何浏览器的绑定        var obj = document.getElementById(objId);        if (obj.addEventListener) {            obj.addEventListener(eventType, callBack, false);        }        else if (window.attachEvent) {            obj.attachEvent('on' + eventType, callBack);        }        else {            obj['on' + eventType] = callBack;        }    }function JSLoad (args) {         s = document.createElement("script");        s.onload = s.onreadystatechange = function () {            if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {                if (typeof args.callback == "function") args.callback(this, args);                s.onload = s.onreadystatechange = null;                try {                    s.parentNode && s.parentNode.removeChild(s);                } catch (e) { }            }        };        document.getElementsByTagName("head")[0].appendChild(s);    }

20 清空 LoadJS 加载到顶部的js引用

function ClearHeadJs  (src) {         var js = document.getElementsByTagName('head')[0].children;        var obj = null;        for (var i = 0; i < js.length; i++) {            if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {                obj = js[i];            }        }        document.getElementsByTagName('head')[0].removeChild(obj);    };

21 JS 替换非法字符主要用在密码验证上出现的特殊字符

function URLencode(sStr) {        return escape(sStr).replace(/\+/g, '%2B').replace(/\"/g, '%22').replace(/\'/g, '%27').replace(/\//g, '%2F');    };

22 按Ctrl + Entert 直接提交表单

document.body.onkeydown = function (evt) {        evt = evt ? evt : (window.event ? window.event : null);        if (13 == evt.keyCode && evt.ctrlKey) {            evt.returnValue = false;            evt.cancel = true;            PostData();        }    };

23 获取当前时间

function GetCurrentDate() {        var d = new Date();        var y = d.getYear()+1900;        month = add_zero(d.getMonth() + 1),        days = add_zero(d.getDate()),        hours = add_zero(d.getHours());        minutes = add_zero(d.getMinutes()),        seconds = add_zero(d.getSeconds());        var str = y + '-' + month + '-' + days + ' ' + hours + ':' + minutes + ':' + seconds;        return str;    };    function add_zero(temp) {        if (temp < 10) return "0" + temp;        else return temp;    }

24 Js 去掉空格方法：

String.prototype.Trim = function(){ return this.replace(/(^\s*)|(\s*$)/g, ""); }String.prototype.LTrim = function(){return this.replace(/(^\s*)/g, "");}String.prototype.RTrim = function(){return this.replace(/(\s*$)/g, "");}

25 js 动态移除 head 里的 js 引用

this.ClearHeadJs = function (src) {        var js = document.getElementsByTagName('head')[0].children;        var obj = null;        for (var i = 0; i < js.length; i++) {            if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {                obj = js[i];            }        }        document.getElementsByTagName('head')[0].removeChild(obj);    };

26 整个UL 点击事件 加在UL里的onclick里

function CreateFrom(url, params) {            var f = document.createElement("form");            f.setAttribute("action", url);            for (var i = 0; i < params.length; i++) {                var input = document.createElement("input");                input.setAttribute("type", "hidden");                input.setAttribute("name", params[i].paramName);                input.setAttribute("value", params[i].paramValue);                f.appendChild(input);            }            f.target = "_blank";            document.body.appendChild(f);            f.submit();        };

27 判断浏览器使用的是哪个 JS 版本

<script language="javascript">      var jsversion = 1.0;    </script>    <script language="javascript1.1">      jsversion = 1.1;    </script>    <script language="javascript1.2">      jsversion = 1.2;    </script>    <script language="javascript1.3">      jsversion = 1.3;    </script>    <script language="javascript1.4">      jsversion = 1.4;    </script>    <script language="javascript1.5">      jsversion = 1.5;    </script>    <script language="javascript1.6">      jsversion = 1.6;    </script>    <script language="javascript1.7">      jsversion = 1.7;    </script>    <script language="javascript1.8">      jsversion = 1.8;    </script>    <script language="javascript1.9">      jsversion = 1.9;    </script>    <script language="javascript2.0">      jsversion = 2.0;    </script>alert(jsversion);