JavaScript 常用方法
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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)),}
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 "";}
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);
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;};
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();
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); } }
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; } } }
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) { $("SubmitLogin").onclick();}}
JS 执行计时器
timeStart = new Date().getTime();timesEnd = new Date().getTime();document.getElementById("time").innerHTML = timesEnd - timeStart;
JS 写Cookie
function setCookie(name, value, expires, path, domain) {if (!expires) expires = -1;if (!path) path = "/";var d = "" + name + "=" + value;var e;if (expires < 0) { e = "";}else if (expires == 0) { var f = new Date(1970, 1, 1); e = ";expires=" + f.toUTCString();}else { var now = new Date(); var f = new Date(now.getTime() + expires * 1000); e = ";expires=" + f.toUTCString();}var dm;if (!domain) { dm = "";}else { dm = ";domain=" + domain;}document.cookie = name + "=" + value + ";path=" + path + e + dm;};
JS读Cookie
function readCookie(name) {var nameEQ = name + "=";var ca = document.cookie.split(';');for (var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1, c.length); if (c.indexOf(nameEQ) == 0) { return decodeURIComponent(c.substring(nameEQ.length, c.length)) }} return null}
Ajax请求
C.ajax = function (args) {var self = this;this.options = { type: 'GET', async: true, contentType: 'application/x-www-form-urlencoded', url: 'about:blank', data: null, success: {}, error: {}};this.getXmlHttp = function () { var xmlHttp; try { xmlhttp = new XMLHttpRequest(); } catch (e) { try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } if (!xmlhttp) { alert('您的浏览器不支持AJAX'); return false; } return xmlhttp;};this.send = function () { C.each(self.options, function (key, val) { self.options[key] = (args[key] == null) ? val : args[key]; }); var xmlHttp = new self.getXmlHttp(); if (self.options.type.toUpperCase() == 'GET') { xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.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();};
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.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
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
function URLencode(sStr) {return escape(sStr).replace(/+/g, '%2B').replace(/"/g, '%22').replace(/'/g, '%27').replace(///g, '%2F');};
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;}
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);};
原文地址:
https://zhuanlan.zhihu.com/p/27867969
作者:花落如海
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