程序員花1小時(shí)寫JavaScript 常用方法總結(jié)
作者：孝道的重要性
當(dāng)今的市場(chǎng)需要快速開(kāi)發(fā)，不論你是一個(gè) JavaScript 新手還是一個(gè)資深的 JavaScript 開(kāi)發(fā)者，都會(huì)用到JavaScript的常用方法，今日記下，以便以后查詢。
經(jīng)常使用的 JS 方法，今天記下，以便以后查詢。
/* 手機(jī)類型判斷 */
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)), }
/* 返回字符串長(zhǎng)度，漢子計(jì)數(shù)為2 */
function strLength(str) { var a = 0; for (var i = 0; i < str.length; i++) { if (str.charCodeAt(i) > 255) a += 2;//按照預(yù)期計(jì)數(shù)增加2 else a++; } return a; }
獲取url中的參數(shù)
function GetQueryStringRegExp(name,url) { var reg = new RegExp("(^|\?|&)" + name + "=([^&]*)(\s|&|$)", "i"); if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/+/g, " ")); return ""; }
/* js 綁定事件 適用于任何瀏覽器的元素綁定 */
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);
/* 獲得當(dāng)前瀏覽器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; }
/* 獲取當(dāng)前點(diǎn)擊事件的Object對(duì)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; };
/* 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; }
/* JS 彈出新窗口全屏 */
var tmp = window.open("about:blank", "", "fullscreen=1") tmp.moveTo(0, 0); tmp.resizeTo(screen.width + 20, screen.height); tmp.focus(); tmp.location.href = '//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('//www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html', "winHanle", config_); //模擬form提交打開(kāi)新頁(yè)面 var f = document.createElement("form"); f.setAttribute('action', '//www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html'); f.target = '_blank'; document.body.appendChild(f); f.submit();
/* 全選/全不選 */
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 判斷瀏覽器 */
判斷是否是 IE 瀏覽器 if (document.all){ alert(”IE瀏覽器”); }else{ alert(”非IE瀏覽器”); } if (!!window.ActiveXObject){ alert(”IE瀏覽器”); }else{ alert(”非IE瀏覽器”); } 判斷是IE幾 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″); } }
/* 判斷瀏覽器 */
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"; } }
/* JS判斷兩個(gè)日期大小 適合 2012-09-09 與2012-9-9 兩種格式的對(duì)比 */
//得到日期值并轉(zhuǎn)化成日期格式，replace(/-/g, "/")是根據(jù)驗(yàn)證表達(dá)式把日期轉(zhuǎn)化成長(zhǎng)日期格式，這樣再進(jìn)行判斷就好判斷了 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('開(kāi)始日期要小于結(jié)束日期'); return false; } } }
/* 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; } }
/* 回車提交 */
$("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) { $("SubmitLogin").onclick(); } }
/* JS 執(zhí)行計(jì)時(shí)器 */
timeStart = new Date().getTime(); timesEnd = new Date().getTime(); document.getElementById("time").innerHTML = timesEnd - timeStart;
/* JS 寫Cookie */
function setCookie(name, value, expires, path, domain) { if (!expires) expires = -1; if (!path) path = "/"; var d = "" + name + "=" + value; var e; if (expires < 0) { e = ""; } else if (expires == 0) { var f = new Date(1970, 1, 1); e = ";expires=" + f.toUTCString(); } else { var now = new Date(); var f = new Date(now.getTime() + expires * 1000); e = ";expires=" + f.toUTCString(); } var dm; if (!domain) { dm = ""; } else { dm = ";domain=" + domain; } document.cookie = name + "=" + value + ";path=" + path + e + dm; };
/* JS 讀Cookie */
function readCookie(name) { var nameEQ = name + "="; var ca = document.cookie.split(';'); for (var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1, c.length); if (c.indexOf(nameEQ) == 0) { return decodeURIComponent(c.substring(nameEQ.length, c.length)) } } return null }
/* Ajax 請(qǐng)求 */
C.ajax = function (args) { var self = this; this.options = { type: 'GET', async: true, contentType: 'application/x-www-form-urlencoded', url: 'about:blank', data: null, success: {}, error: {} }; this.getXmlHttp = function () { var xmlHttp; try { xmlhttp = new XMLHttpRequest(); } catch (e) { try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } if (!xmlhttp) { alert('您的瀏覽器不支持AJAX'); return false; } return xmlhttp; }; this.send = function () { C.each(self.options, function (key, val) { self.options[key] = (args[key] == null) ? val : args[key]; }); var xmlHttp = new self.getXmlHttp(); if (self.options.type.toUpperCase() == 'GET') { xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.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 */
function StringBuilder() { this.strings = new Array; }; StringBuilder.prototype.append = function (str) { this.strings.push(str); }; StringBuilder.prototype.toString = function () { return this.strings.join(''); };
/* JS 加載到頂部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) { //適用于任何瀏覽器的綁定 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 加載到頂部的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); };
/* JS 替換非法字符主要用在密碼驗(yàn)證上出現(xiàn)的特殊字符 */
function URLencode(sStr) { return escape(sStr).replace(/+/g, '%2B').replace(/"/g, '%22').replace(/'/g, '%27').replace(///g, '%2F'); };
/* 按Ctrl + Entert 直接提交表單 */
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(); } };
/* 獲取當(dāng)前時(shí)間 */
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： */
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 動(dòng)態(tài)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); };
/* 整個(gè)UL 點(diǎn)擊事件 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(); };
/* 判斷瀏覽器使用的是哪個(gè) 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);
***在說(shuō)幾句：厲害程序員相對(duì)于普通程序員的優(yōu)勢(shì)在于：寫出的代碼更容易排錯(cuò)，不是高手的代碼就不會(huì)錯(cuò)，而是高手的代碼出了錯(cuò)容易找。高手的代碼可讀性一定很好，模塊清晰，命名規(guī)范，格式工整，關(guān)鍵的地方有注釋，出了異常有l(wèi)og，自然容易排錯(cuò)，即使交給別人去debug也是比較容易的。
責(zé)任編輯：張燕妮
來(lái)源：
頭條科技
