28个常用JavaScript方法集锦

前端技术 2023/09/04 JavaScript

经常使用的 JS 方法，今天记下，以便以后查询

/* 手机类型判断 */

\\\\s|&|$)\", \"i\");
    if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/\\+/g, \" \")); return \"\";
}
　　

/* js 绑定事件 适用于任何浏览器的元素绑定  */

复制代码 代码如下:

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);
　　

/* 获得当前浏览器JS的版本 */

复制代码 代码如下:

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;
}

/* 获取当前点击事件的Object对象 */

复制代码 代码如下:

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;
};
　　

/* 字符串截取方法  */

复制代码 代码如下:

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;
    }
　　

/*  JS 弹出新窗口全屏  */

复制代码 代码如下:

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();

/*   全选/全不选  */

复制代码 代码如下:

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);
            }
        }
　　

/* js 判断浏览器  */

复制代码 代码如下:

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″);
    }
}
　　

/* 判断浏览器 */

复制代码 代码如下:

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\";
    }
}
　　

/*  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  */

复制代码 代码如下:

//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;
                }
            }
        }
　　

/* 移除事件 */

复制代码 代码如下:

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;
    }
}
　　

/* 回车提交 */

复制代码 代码如下:

$(\"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();
    }
}
　　

/* JS 执行计时器 */

复制代码 代码如下:

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

/* JS 写Cookie */

复制代码 代码如下:

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;
};
　　

/* JS 读Cookie  */

复制代码 代码如下:

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
}
　　

/*  Ajax 请求  */

复制代码 代码如下:

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();
};

/*  JS StringBuilder 用法  */

复制代码 代码如下:

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

/* JS 加载到顶部LoadJS  */

复制代码 代码如下:

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.setAttribute(\"type\", \"text/javascript\");
        s.setAttribute(\"src\", args.url);
        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);
    }
　　

/*  清空 LoadJS 加载到顶部的js引用  */

复制代码 代码如下:

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);
    };
　　

/*  JS 替换非法字符主要用在密码验证上出现的特殊字符  */

复制代码 代码如下:

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

/*  按Ctrl + Entert 直接提交表单   */

复制代码 代码如下:

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();
    }
};

　　
/* 获取当前时间  */

复制代码 代码如下:

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;
    }

　　
/* Js 去掉空格方法：  */

复制代码 代码如下:

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, \"\");}

/* js 动态移除 head 里的 js 引用  */

复制代码 代码如下:

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);
};
　　

/*  整个UL 点击事件  加在UL里的onclick里 */

复制代码 代码如下:

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();
 };

/* 判断浏览器使用的是哪个 JS 版本 */

复制代码 代码如下:

<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);

以上就是本文的全部内容了，希望能对大家有所帮助，也不枉整理这么久了，呵呵。

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