28个常用JavaScript方法集锦
经常使用的JS方法，今天记下，以便以后查询
/*手机类型判断*/
varBrowserInfo={
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 */
functionstrLength(str){
vara=0;
for(vari=0;i<str.length;i++){
if(str.charCodeAt(i)>255)
a+=2;//按照预期计数增加2
else
a++;
}
returna;
}
获取url中的参数
functionGetQueryStringRegExp(name,url){
varreg=newRegExp("(^|\\?|&)"+name+"=([^&]*)(\\s|&|$)","i");
if(reg.test(url))returndecodeURIComponent(RegExp.$2.replace(/\+/g,""));return"";
}
/*js绑定事件适用于任何浏览器的元素绑定 */
functioneventBind(obj,eventType,callBack){
if(obj.addEventListener){
obj.addEventListener(eventType,callBack,false);
}
elseif(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*/
functiongetjsversion(){
varn=navigator;
varu=n.userAgent;
varapn=n.appName;
varv=n.appVersion;
varie=v.indexOf('MSIE');
if(ie>0){
apv=parseInt(i=v.substring(ie+5));
if(apv>3){
apv=parseFloat(i);
}
}else{
apv=parseFloat(v);
}
varisie=(apn=='MicrosoftInternetExplorer');
varismac=(u.indexOf('Mac')>=0);
varjavascriptVersion="1.0";
if(String&&String.prototype){
javascriptVersion='1.1';
if(javascriptVersion.match){
javascriptVersion='1.2';
vartm=newDate;
if(tm.setUTCDate){
javascriptVersion='1.3';
if(isie&&ismac&&apv>=5)javascriptVersion='1.4';
varpn=0;
if(pn.toPrecision){
javascriptVersion='1.5';
a=newArray;
if(a.forEach){
javascriptVersion='1.6';
i=0;
o=newObject;
tcf=newFunction('o','vare,i=0;try{i=newIterator(o)}catch(e){}returni');
i=tcf(o);
if(i&&i.next){
javascriptVersion='1.7';
}
}
}
}
}
}
returnjavascriptVersion;
}
/*获取当前点击事件的Object对象*/
functiongetEvent(){
if(document.all){
returnwindow.event;//如果是ie
}
func=getEvent.caller;
while(func!=null){
vararg0=func.arguments[0];
if(arg0){
if((arg0.constructor==Event||arg0.constructor==MouseEvent)
||(typeof(arg0)=="object"&&arg0.preventDefault&&arg0.stopPropagation)){
returnarg0;
}
}
func=func.caller;
}
returnnull;
};
/*字符串截取方法 */
getCharactersLen:function(charStr,cutCount){
if(charStr==null||charStr=='')return'';
vartotalCount=0;
varnewStr='';
for(vari=0;i<charStr.length;i++){
varc=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);
}
}
returnnewStr;
}
/* JS弹出新窗口全屏 */
vartmp=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';
varconfig_="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
varf=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 */
functionselectAll(objSelect){
if(objSelect.checked==true){
$("input[name='chkId']").attr("checked",true);
$("input[name='chkAll']").attr("checked",true);
}
elseif(objSelect.checked==false){
$("input[name='chkId']").attr("checked",false);
$("input[name='chkAll']").attr("checked",false);
}
}
/*js判断浏览器 */
判断是否是IE浏览器
if(document.all){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
if(!!window.ActiveXObject){
alert(”IE浏览器”);
}else{
alert(”非IE浏览器”);
}
判断是IE几
varisIE=!!window.ActiveXObject;
varisIE6=isIE&&!window.XMLHttpRequest;
varisIE8=isIE&&!!document.documentMode;
varisIE7=isIE&&!isIE6&&!isIE8;
if(isIE){
if(isIE6){
alert(”ie6″);
}elseif(isIE8){
alert(”ie8″);
}elseif(isIE7){
alert(”ie7″);
}
}
/*判断浏览器*/
functiongetOs(){
if(navigator.userAgent.indexOf("MSIE8.0")>0){
return"MSIE8";
}
elseif(navigator.userAgent.indexOf("MSIE6.0")>0){
return"MSIE6";
}
elseif(navigator.userAgent.indexOf("MSIE7.0")>0){
return"MSIE7";
}
elseif(isFirefox=navigator.userAgent.indexOf("Firefox")>0){
return"Firefox";
}
if(navigator.userAgent.indexOf("Chrome")>0){
return"Chrome";
}
else{
return"Other";
}
}
/* JS判断两个日期大小适合2012-09-09与2012-9-9两种格式的对比 */
//得到日期值并转化成日期格式，replace(/\-/g,"\/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了
functionValidateDate(){
varbeginDate=$("#t_datestart").val();
varendDate=$("#t_dateend").val();
if(beginDate.length>0&&endDate.length>0){
varsDate=newDate(beginDate.replace(/\-/g,"\/"));
vareDate=newDate(endDate.replace(/\-/g,"\/"));
if(sDate>eDate){
alert('开始日期要小于结束日期');
returnfalse;
}
}
}
/*移除事件*/
this.moveBind=function(objId,eventType,callBack){
varobj=document.getElementById(objId);
if(obj.removeEventListener){
obj.removeEventListener(eventType,callBack,false);
}
elseif(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){
$("SubmitLogin").onclick();
}
}
/*JS执行计时器*/
timeStart=newDate().getTime();
timesEnd=newDate().getTime();
document.getElementById("time").innerHTML=timesEnd-timeStart;
/*JS写Cookie*/
functionsetCookie(name,value,expires,path,domain){
if(!expires)expires=-1;
if(!path)path="/";
vard=""+name+"="+value;
vare;
if(expires<0){
e="";
}
elseif(expires==0){
varf=newDate(1970,1,1);
e=";expires="+f.toUTCString();
}
else{
varnow=newDate();
varf=newDate(now.getTime()+expires*1000);
e=";expires="+f.toUTCString();
}
vardm;
if(!domain){
dm="";
}
else{
dm=";domain="+domain;
}
document.cookie=name+"="+value+";path="+path+e+dm;
};
/*JS读Cookie */
functionreadCookie(name){
varnameEQ=name+"=";
varca=document.cookie.split(';');
for(vari=0;i<ca.length;i++){
varc=ca[i];
while(c.charAt(0)=='')c=c.substring(1,c.length);
if(c.indexOf(nameEQ)==0){
returndecodeURIComponent(c.substring(nameEQ.length,c.length))
}
}returnnull
}
/* Ajax请求 */
C.ajax=function(args){
varself=this;
this.options={
type:'GET',
async:true,
contentType:'application/x-www-form-urlencoded',
url:'about:blank',
data:null,
success:{},
error:{}
};
this.getXmlHttp=function(){
varxmlHttp;
try{
xmlhttp=newXMLHttpRequest();
}
catch(e){
try{
xmlhttp=newActiveXObject("Msxml2.XMLHTTP");
}
catch(e){
xmlHttp=newActiveXObject("Microsoft.XMLHTTP");
}
}
if(!xmlhttp){
alert('您的浏览器不支持AJAX');
returnfalse;
}
returnxmlhttp;
};
this.send=function(){
C.each(self.options,function(key,val){
self.options[key]=(args[key]==null)?val:args[key];
});
varxmlHttp=newself.getXmlHttp();
if(self.options.type.toUpperCase()=='GET'){
xmlHttp.open(self.options.type,self.options.url+(self.options.data==null?"":((/[?]$/.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(typeofself.options.success=='function')self.options.success(xmlHttp.responseText);
xmlHttp=null;
}
else{
if(typeofself.options.error=='function')self.options.error('ServerStatus:'+xmlHttp.status);
}
}
};
xmlHttp.send(self.options.type.toUpperCase()=='POST'?self.options.data.toString():null);
};
this.send();
};
/* JSStringBuilder用法 */
functionStringBuilder(){
this.strings=newArray;
};
StringBuilder.prototype.append=function(str){
this.strings.push(str);
};
StringBuilder.prototype.toString=function(){
returnthis.strings.join('');
};
/*JS加载到顶部LoadJS */
functionloadJS(url,fn){
varss=document.getElementsByName('script'),
loaded=false;
for(vari=0,len=ss.length;i<len;i++){
if(ss[i].src&&ss[i].getAttribute('src')==url){
loaded=true;
break;
}
}
if(loaded){
if(fn&&typeoffn!='undefined'&&fninstanceofFunction)fn();
returnfalse;
}
vars=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&&typeoffn!='undefined'&&fninstanceofFunction)fn();
}
};
document.getElementsByTagName('head')[0].appendChild(s);
},
bind:function(objId,eventType,callBack){ //适用于任何浏览器的绑定
varobj=document.getElementById(objId);
if(obj.addEventListener){
obj.addEventListener(eventType,callBack,false);
}
elseif(window.attachEvent){
obj.attachEvent('on'+eventType,callBack);
}
else{
obj['on'+eventType]=callBack;
}
}
functionJSLoad(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(typeofargs.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 */
functionClearHeadJs (src){
varjs=document.getElementsByTagName('head')[0].children;
varobj=null;
for(vari=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 */
functionURLencode(sStr){
returnescape(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 */
functionGetCurrentDate(){
vard=newDate();
vary=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());
varstr=y+'-'+month+'-'+days+''+hours+':'+minutes+':'+seconds;
returnstr;
};
functionadd_zero(temp){
if(temp<10)return"0"+temp;
elsereturntemp;
}
/*Js去掉空格方法： */
String.prototype.Trim=function()
{returnthis.replace(/(^\s*)|(\s*$)/g,"");}
String.prototype.LTrim=function()
{returnthis.replace(/(^\s*)/g,"");}
String.prototype.RTrim=function()
{returnthis.replace(/(\s*$)/g,"");}
/*js动态移除head里的js引用 */
this.ClearHeadJs=function(src){
varjs=document.getElementsByTagName('head')[0].children;
varobj=null;
for(vari=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*/
functionCreateFrom(url,params){
varf=document.createElement("form");
f.setAttribute("action",url);
for(vari=0;i<params.length;i++){
varinput=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*/
<scriptlanguage="javascript">
varjsversion=1.0;
</script>
<scriptlanguage="javascript1.1">
jsversion=1.1;
</script>
<scriptlanguage="javascript1.2">
jsversion=1.2;
</script>
<scriptlanguage="javascript1.3">
jsversion=1.3;
</script>
<scriptlanguage="javascript1.4">
jsversion=1.4;
</script>
<scriptlanguage="javascript1.5">
jsversion=1.5;
</script>
<scriptlanguage="javascript1.6">
jsversion=1.6;
</script>
<scriptlanguage="javascript1.7">
jsversion=1.7;
</script>
<scriptlanguage="javascript1.8">
jsversion=1.8;
</script>
<scriptlanguage="javascript1.9">
jsversion=1.9;
</script>
<scriptlanguage="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。