程序员花1小时写JavaScript 常用方法总结

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经常使用的 JS 方法，今天记下，以便以后查询。

/* 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)),

}

 

/* 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;

}

 

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;

}

 

/* 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 = '//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_);

//模拟form提交打开新页面

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″);

}

}

 

/* 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";

}

}

 

/* 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');

};

 

/* 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();

}

};

 

/* 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);

};

 

/* 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();

};

 

/* 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);

 

***在说几句：厉害程序员相对于普通程序员的优势在于：写出的代码更容易排错，不是高手的代码就不会错，而是高手的代码出了错容易找。高手的代码可读性一定很好，模块清晰，命名规范，格式工整，关键的地方有注释，出了异常有log，自然容易排错，即使交给别人去debug也是比较容易的。