JavaScript常用代码总结
本帖最后由 断天涯大虾 于 2017-4-19 09:38 编辑分享了一些常用JavaScript代码，有：1.手机类型判断、2.字符串长度、3.获取url中的参数、4.js 绑定事件、5.当前浏览器JS的版本、6.全选/全不选、7.移除事件、8.回车提交、9.ajax提交等。
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2function 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;
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 + '.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 + '.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 + '.html');
f.target = '_blank';
document.body.appendChild(f);
f.submit();
/* 全选/全不选 */function selectAll(objSelect) {
if (objSelect.checked == true) {
$("input").attr("checked", true);
$("input").attr("checked", true);
}
else if (objSelect.checked == false) {
$("input").attr("checked", false);
$("input").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) {
$("SubmitLogin").onclick();
}
}
/* JS 执行计时器 */timeStart = new Date().getTime();
timesEnd = new Date().getTime();
document.getElementById("time").innerHTML = timesEnd - timeStart;
/* JS 写Cookie */function setCookie(name, value, expires, path, domain) {
if (!expires) expires = -1;
if (!path) path = "/";
var d = "" + name + "=" + value;
var e;
if (expires < 0) {
e = "";
}
else if (expires == 0) {
var f = new Date(1970, 1, 1);
e = ";expires=" + f.toUTCString();
}
else {
var now = new Date();
var f = new Date(now.getTime() + expires * 1000);
e = ";expires=" + f.toUTCString();
}
var dm;
if (!domain) {
dm = "";
}
else {
dm = ";domain=" + domain;
}
document.cookie = name + "=" + value + ";path=" + path + e + dm;
};
/* JS 读Cookie */function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca;
while (c.charAt(0) == ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) {
return decodeURIComponent(c.substring(nameEQ.length, c.length))
}
} return null
}
/* Ajax 请求 */C.ajax = function (args) {
var self = this;
this.options = {
type: 'GET',
async: true,
contentType: 'application/x-www-form-urlencoded',
url: 'about:blank',
data: null,
success: {},
error: {}
};
this.getXmlHttp = function () {
var xmlHttp;
try {
xmlhttp = new XMLHttpRequest();
}
catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
if (!xmlhttp) {
alert('您的浏览器不支持AJAX');
return false;
}
return xmlhttp;
};
this.send = function () {
C.each(self.options, function (key, val) {
self.options = (args == null) ? val : args;
});
var xmlHttp = new self.getXmlHttp();
if (self.options.type.toUpperCase() == 'GET') {
xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.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.src && ss.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').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").appendChild(s);
}
/* 清空 LoadJS 加载到顶部的js引用 */function ClearHeadJs(src) {
var js = document.getElementsByTagName('head').children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js.tagName.toLowerCase() == "script" && js.attributes['src'].value.indexOf(src) > 0) {
obj = js;
}
}
document.getElementsByTagName('head').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').children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js.tagName.toLowerCase() == "script" && js.attributes['src'].value.indexOf(src) > 0) {
obj = js;
}
}
document.getElementsByTagName('head').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.paramName);
input.setAttribute("value", params.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);
本文希望能给入门或迷茫的同学一些建议，合不合适只有自己才是最明白的，欢迎留言。另外新手学习前端开发除了要多动手敲代码最重要的还是经验的交流欢迎有需要的的小伙伴进前端开发交流群624293552来一起交流问题学习经验，我把所有比较适合新手学习的教程资料都放到里了。
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