// querySelector() 返回匹配到的第一个元素var item = document.querySelector('.item')console.log(item)// querySelectorAll() 返回匹配到的所有元素,是一个nodeList集合var items = document.querySelectorAll('.item')console.log(items[0])1234567
阻止默认行为
// 原生jsdocument.getElementById('btn').addEventListener('click', function (event) {event = event || window.event;if (event.preventDefault){// w3c方法 阻止默认行为
event.preventDefault()
} else{// ie 阻止默认行为
event.returnValue = false
}
}, false)// jQuery$('#btn').on('click', function (event) {event.preventDefault()
})1234567891011121314151617
阻止冒泡
// 原生jsdocument.getElementById('btn').addEventListener('click', function (event) {event = event || window.event;if (event.stopPropagation){// w3c方法 阻止冒泡
event.stopPropagation()
} else{// ie 阻止冒泡
event.cancelBubble = true
}
}, false)// jQuery$('#btn').on('click', function (event) {event.stopPropagation()
})1234567891011121314151617
鼠标滚轮事件
$('#content').on("mousewheel DOMMouseScroll", function (event) {
// chrome &ie || // firefox
var delta = (event.originalEvent.wheelDelta &&(event.originalEvent.wheelDelta >0 ? 1 : -1)) || (event.originalEvent.detail &&(event.originalEvent.detail >0 ? -1 : 1))
if (delta >0) {
// 向上滚动
console.log('mousewheel top')
} else if (delta <0) {// 向下滚动
console.log('mousewheel bottom')
}
})123456789101112
检测浏览器是否支持svg
function isSupportSVG() {
var SVG_NS = 'http://www.w3.org/2000/svg' return !!document.createElementNS &&!!document.createElementNS(SVG_NS, 'svg').createSVGRect
}
// 测试console.log(isSupportSVG())1234567
检测浏览器是否支持canvas
function isSupportCanvas() {
if(document.createElement('canvas').getContext){return true
}else{return false
}
}// 测试,打开谷歌浏览器控制台查看结果console.log(isSupportCanvas())12345678910
检测是否是微信浏览器
function isWeiXinClient() {
var ua = navigator.userAgent.toLowerCase()
if (ua.match(/MicroMessenger/i)=="micromessenger") {
return true
} else {
return false
}
}// 测试alert(isWeiXinClient())1234567891011
jQuery 获取鼠标在图片上的坐标
$('#myImage').click(function(event){
//获取鼠标在图片上的坐标
console.log('X:' + event.offsetX+'\n Y:' + event.offsetY)
//获取元素相对于页面的坐标
console.log('X:'+$(this).offset().left+'\n Y:'+$(this).offset().top)
})1234567
验证码倒计时代码
<!-- dom --><input id="send" type="button" value="发送验证码">12
// 原生js版本var times = 60, // 临时设为60秒
timer = null
document.getElementById('send').onclick = function () {
// 计时开始
timer = setInterval(function () {
times-- if (times <= 0) {
send.value = '发送验证码'
clearInterval(timer)
send.disabled = false
times = 60
} else {
send.value = times + '秒后重试'
send.disabled = true
}
}, 1000)
}1234567891011121314151617181920
// jQuery版本var times = 60,
timer = null
$('#send').on('click', function () {
var $this = $(this) // 计时开始
timer = setInterval(function () {
times-- if (times <= 0) {
$this.val('发送验证码')
clearInterval(timer)
$this.attr('disabled', false)
times = 60
} else {
$this.val(times + '秒后重试')
$this.attr('disabled', true)
}
}, 1000)
})12345678910111213141516171819202122
常用的一些正则表达式
//匹配字母、数字、中文字符
/^([A-Za-z0-9]|[\u4e00-\u9fa5])*$/
//验证邮箱
/^\w+@([0-9a-zA-Z]+[.])+[a-z]{2,4}$/
//验证手机号
/^1[3|5|8|7]\d{9}$/
//验证URL
/^http:\/\/.+\./
//验证身份证号码
/(^\d{15}$)|(^\d{17}([0-9]|X|x)$)/
//匹配中文字符的正则表达式
/[\u4e00-\u9fa5]/
//匹配双字节字符(包括汉字在内)
/[^\x00-\xff]/1234567891011121314151617181920
js时间戳、毫秒格式化
function formatDate(now) {
var y = now.getFullYear() var m = now.getMonth() + 1// 注意js里的月要加1
var d = now.getDate() var h = now.getHours()
var m = now.getMinutes()
var s = now.getSeconds() return y + "-" + m + "-" + d + " " + h + ":" + m + ":" + s
}
var nowDate = new Date(2016, 5, 13, 19, 18, 30, 20)
console.log(nowDate.getTime())// 获得当前毫秒数: 1465816710020console.log(formatDate(nowDate))123456789101112131415
js限定字符数(注意:一个汉字算2个字符)
<input id="txt" type="text">//字符串截取function getByteVal(val, max) {
var returnValue = '' var byteValLen = 0 for (var i = 0i <val.lengthi++) {if (val[i].match(/[^\x00-\xff]/ig) != null) byteValLen += 2else byteValLen += 1 if (byteValLen >max) break
returnValue += val[i]
}return returnValue
}
$('#txt').on('keyup', function () {
var val = this.value if (val.replace(/[^\x00-\xff]/g, "**").length >14) {this.value = getByteVal(val, 14)
}
})12345678910111213141516171819
js判断是否移动端及浏览器内核
var browser = {
versions: function() {
var u = navigator.userAgent
return {
trident: u.indexOf('Trident') >-1, //IE内核
presto: u.indexOf('Presto') >-1, //opera内核
webKit: u.indexOf('AppleWebKit') >-1, //苹果、谷歌内核
gecko: u.indexOf('Firefox') >-1, //火狐内核Gecko
mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
ios: !!u.match(/\(i[^]+( U)? CPU.+Mac OS X/), //ios
android: u.indexOf('Android') >-1 || u.indexOf('Linux') >-1, //android
iPhone: u.indexOf('iPhone') >-1 , //iPhone
iPad: u.indexOf('iPad') >-1, //iPad
webApp: u.indexOf('Safari') >-1 //Safari
}
}
}
if (browser.versions.mobile() || browser.versions.ios() || browser.versions.android() || browser.versions.iPhone() || browser.versions.iPad()) {
alert('移动端')
}123456789101112131415161718192021
之前我用过一个检测客户端的库 觉得挺好用的,也推荐给大家 叫 device.js,大家可以 Googel 或 百度
GItHub仓库地址:https://github.com/matthewhudson/device.js
getBoundingClientRect() 获取元素位置
//它返回一个对象,其中包含了left、right、top、bottom四个属性var myDiv = document.getElementById('myDiv')var x = myDiv.getBoundingClientRect().left
var y = myDiv.getBoundingClientRect().top
// 相当于jquery的: $(this).offset().left、$(this).offset().top // js的:this.offsetLeft、this.offsetTop123456
HTML5全屏
function fullscreen(element) {
if (element.requestFullscreen) {
element.requestFullscreen()
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen()
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen()
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen()
}}
fullscreen(document.documentElement)12345678910111213
JS特效就是网页中实现的特殊效果或者特殊的功能的一种技术,是用网页脚本(javascript)来编写制作动态特殊效果。
比如图片切换,渐变等等,它为网页活跃了网页的气氛,有时候会起到一定的亲切力。
JavaScript 是根据 "ECMAScript"标准制定的网页脚本语言。这个标准由 ECMA 组织发展和维护。ECMA-262 是正式的 JavaScript 标准。
扩展资料:
能够具有交互性,能够包含更多活跃的元素,就有必要在网页中嵌入其它的技术。如:Javascript、VBScript、Document Object Model(DOM,文档对象模型)、Layers和 Cascading Style Sheets(CSS,层叠样式表)。
JavaScript 使网页增加互动性。JavaScript 使有规律地重复的HTML文段简化,减少下载时间。JavaScript 能及时响应用户的操作,对提交表单做即时的检查,无需浪费时间交由 CGI 验证。JavaScript 的特点是无穷无尽的,只要你有创意。
<script>
function CoolMenuControl(){
// 常规变量 this lastScrollX= this lastScrollY= this lastScrollW= this lastScrollH= this td_X= this td_Y= this td_W= this td_H= this td= this mouseon= this current=null this _namethis table_namethis menudiv_namethis menutable_namethis ml= this menuarray=new Array()this speedthis href=""
// 菜单项目 function menuitem(type value url target){ this type=type this value=value this url=url this target=target }
// 插入菜单 this insertmenu=function(type value url target){ this menuarray[this menuarray length]=new menuitem(type value url target) }
// 程序初试化 this init=function(name bdc bgc speed Alpha){ var in="" var cellcount= var lastcellcount= this _name=name+"" this table_name=name+"table" this menudiv_name=name+"menudiv" this menutable_name=name+"menutable" this speed=speed
for (i= i<this menuarray lengthi++) { if (this menuarray[i] type==" ") cellcount=cellcount+ if (this menuarray[i] type==" " || this menuarray[i] type==" ") {cellcount= } if (lastcellcount<cellcount) {lastcellcount++} }
//alert(cellcount)
stylecode="cursor:handfilter:Alpha(style= opacity="+Alpha+")background color:"+bgc
suspendcode="<DIV id="+this _name+" style= POSITION:absoluteonclick= "+name+" doClick() >" +"<table id="+this table_name+" border= width= cellspacing= style= border collapse: collapse bordercolor= "+bdc+" >" +"<tr><td height= style= "+stylecode+" ></td></tr></table></div>"document write(suspendcode)var fcell=true for (i= i<this menuarray lengthi++) { switch(this menuarray[i] type) { case " ": t=cellcount* if (t<= ) { in+= <tr><td colspan= class=ht onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value } else { in+= <tr><td colspan= +t+ class=ht onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value } fcell=true break case " ": t=(cellcount )* if (t<= ) { in+= <tr><td width= ><td onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value } else { in+= <tr><td width= ><td colspan= +t+ onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value } fcell=true break case " ": if (fcell) { in+= <tr><td width= ><td onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value fcell=false } else { in+= <td width= ><td onmouseover= +name+ href=" +this menuarray[i] url+ +this menuarray[i] target+ " >+this menuarray[i] value } break } } in= <div id= +this menudiv_name+ onmousemove=" +name+ doOver()"> + <table id= +this menutable_name+ border= cellpadding=" " class="menu" cellspacing=" "> +in + </table></div>//alert(in) document write(in)
this lastScrollX= this lastScrollY= this posXY(eval(this menutable_name) cells[ ]) this td_W=eval(this menutable_name) cells[ ] scrollWidth+ this td_H=eval(this menutable_name) cells[ ] scrollHeight setInterval(name+" scrollback()" ) }
// 单击超连接 this doClick=function(){ //alert(this url) var url=this href split(" ") //alert(url[ ]) //alert(url[ ]) if (url[ ]=="") return
if (url[ ]=="_blank") {window open(url[ ])} else {location href=url[ ]} }
// 滑动处理 this scrollback=function(){ diffX=this td_X diffY=this td_Y diffW=this td_W diffH=this td_H percentX=this speed*(diffX this lastScrollX)percentY=this speed*(diffY this lastScrollY)percentW=this speed*(diffW this lastScrollW)percentH=this speed*(diffH this lastScrollH)
if(percentX>)percentX=Math ceil(percentX)else percentX=Math floor(percentX)if(percentY>)percentY=Math ceil(percentY)else percentY=Math floor(percentY)if(percentW>)percentW=Math ceil(percentW)else percentW=Math floor(percentW)if(percentH>)percentH=Math ceil(percentH)else percentH=Math floor(percentH)
eval(this _name) style pixelTop+=percentYeval(this _name) style pixelLeft+=percentXeval(this table_name) style pixelWidth+=percentWeval(this table_name) style pixelHeight+=percentH
this lastScrollX=this lastScrollX+percentXthis lastScrollY=this lastScrollY+percentYthis lastScrollW=this lastScrollW+percentWthis lastScrollH=this lastScrollH+percentH}
// 滑出 this doOver=function() { if (event srcElement tagName=="TD") { if (event srcElement innerText length== || event srcElement innerText=="|") return this posXY(event srcElement) this td_W=event srcElement scrollWidth+ this td_H=event srcElement scrollHeight } }
// 绝对定位 this posXY=function(obj){ _left=obj offsetLeft _top=obj offsetTop vParent = obj offsetParent while (vParent tagName toUpperCase() != "BODY") { _left += vParent offsetLeft _top += vParent offsetTop vParent = vParent offsetParent } this td_X=_left this td_Y=_top }
// 关于 this about=function(){ alert("OK") }
} </script>
<head><meta equiv="Content Language" content="zh cn"><style>b{color=# cursor:hand} menu { font family:Arialcursor:Defaultfont size: pxborder: px # solidborder collapse: collapsefilter:progid:DXImageTransform Microsoft Gradient(gradienttype= startcolorstr=#ffffff endcolorstr=#dddddd) progid:DXImageTransform Microsoft Shadow(direction= color=#cccccc strength= )} ht{ font weight:bold } </style><! 第一步 实体化X Menu类 用法: var <实体变量>new CoolMenuControl() ><script language="javascript">var CoolMenu =new CoolMenuControl() var about=new Array() about[ ]="关于X Menu菜单nnAuthor:PuterJamnCopyright n转载请通知本人" about[ ]="关于作者nn"这家伙很懒 什么也没留下!!"
</script></head><body><! 第二步 建立菜单项目 用法: <实体变量>insertmenu(类型 Html代码 链接网址 目标) 类型 0代表菜单标题 1代表树型菜单子项目 2代表横向菜单子项目 Html代码 显示在菜单上的Html代码 链接网址 不用多说了 网址或Javascript脚本 目标 默认为空 既不在本页打开 "_blank"代表在新的页面打开 例如: CoolMenu insertmenu(" " "<img src=// blueidea /img/icon/arrow gif>新浪网" " "_blank") ><script>CoolMenu insertmenu(" " "本站首页" "" "") CoolMenu insertmenu(" " "新闻中心" " "_blank") CoolMenu insertmenu(" " "文章中心" " "_blank") CoolMenu insertmenu(" " "图片欣赏" " "_blank") CoolMenu insertmenu(" " "软件下载" " "_blank") CoolMenu insertmenu(" " "娱乐欣赏" " "_blank") </script>
lishixinzhi/Article/program/Java/JSP/201311/19958