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<html >
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="js/jquery-3.4.1.min.js"></script>
<script src="js/DD_belatedPNG.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.menu li').hover(function(){
$(this).children('ul').show();
$(this).focus().addClass('focusa')
},function(){
$(this).children('ul').hide();
$(this).focus().removeClass('focusa')
});
DD_belatedPNG.fix('ul,.more');
});
</script>
<style type="text/css">
* { padding:0; margin:0; }
body { font-size:12px; background:#000; font-family:"宋體"; }
ul { list-style-type:none; }
a { color:#fff; text-decoration:none; }
.container {
width:1024px; height:1000px;
background:url(images/sl05.PNG) no-repeat;
margin:0 auto;
padding-top:100px;
}
.menu {
height:30px; line-height:30px;
background:url(images/bg_4.png) repeat-x;
}
.menu li { float:left; position:relative; }
.menu li a:hover { color:#000; background:url(images/bg_4.png); }
.menu li.focusa { background:url(images/bg_focus.png); }
.menu li a {
display:block;
float:left;
height:30px;
line-height:30px;
padding:0 20px;
}
.menu li ul {
position:absolute;
left:0;
background:url(images/bg_5.png);
width:150px;
border:1px solid #000;
display:none;
}
.menu li ul a { width:110px; }
.one { border:1px solid #000; top:30px; }
.one li a:hover { background:url(images/bg_4.png); }
.menu li ul.two { left:150px; }
.one li a.more { background:url(images/arrow.png) no-repeat 130px center; }
.one li a.more:hover { background:url(images/arrow.png) no-repeat 130px center; }
.menu li ul.hdw { left:150px; }
.menu li ul.hdwq { left:150px; }
</style>
</head>
<body>
<div class="container">
<ul class="menu">
<li><a href="#">菜單一</a>
<ul class="one">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#" class="more">菜單五</a>
<ul class="two">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#" class="more">菜單五</a>
<ul class="hdw">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#" class="more">菜單五</a>
<ul class="hdwq">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#">菜單五</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="#">菜單二</a>
<ul class="one">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#" class="more">菜單三</a>
<ul class="two">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#" class="more">菜單三</a>
<ul class="hdw">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#">菜單五</a></li>
</ul>
</li>
<li><a href="#">菜單四</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">菜單三</a></li>
<li><a href="#">菜單四</a></li>
<li><a href="#">菜單五</a>
<ul class="one">
<li><a href="#">菜單一</a></li>
<li><a href="#">菜單二</a></li>
<li><a href="#">菜單三</a></li>
</ul>
</li>
</ul>
</div>
</body>
</html>
D_belatedPNG.js
/**
* DD_belatedPNG: Adds IE6 support: PNG images for CSS background-image and HTML <IMG/>.
* Author: Drew Diller
* Email: drew.diller@gmail.com
* URL: http://www.dillerdesign.com/experiment/DD_belatedPNG/
* Version: 0.0.8a
* Licensed under the MIT License: http://dillerdesign.com/experiment/DD_belatedPNG/#license
*
* Example usage:
* DD_belatedPNG.fix('.png_bg'); // argument is a CSS selector
* DD_belatedPNG.fixPng( someNode ); // argument is an HTMLDomElement
**/
/*
PLEASE READ:
Absolutely everything in this script is SILLY. I know this. IE's rendering of certain pixels doesn't make sense, so neither does this code!
*/
var DD_belatedPNG={
ns: 'DD_belatedPNG',
imgSize: {},
delay: 10,
nodesFixed: 0,
createVmlNameSpace: function () { /* enable VML */
if (document.namespaces && !document.namespaces[this.ns]) {
document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml');
}
},
createVmlStyleSheet: function () { /* style VML, enable behaviors */
/*
Just in case lots of other developers have added
lots of other stylesheets using document.createStyleSheet
and hit the 31-limit mark, let's not use that method!
further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx
*/
var screenStyleSheet, printStyleSheet;
screenStyleSheet=document.createElement('style');
screenStyleSheet.setAttribute('media', 'screen');
document.documentElement.firstChild.insertBefore(screenStyleSheet, document.documentElement.firstChild.firstChild);
if (screenStyleSheet.styleSheet) {
screenStyleSheet=screenStyleSheet.styleSheet;
screenStyleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
screenStyleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
screenStyleSheet.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;'); /* large negative top value for avoiding vertical scrollbars for large images, suggested by James O'Brien, http://www.thanatopsic.org/hendrik/ */
this.screenStyleSheet=screenStyleSheet;
/* Add a print-media stylesheet, for preventing VML artifacts from showing up in print (including preview). */
/* Thanks to R?mi Pr?vost for automating this! */
printStyleSheet=document.createElement('style');
printStyleSheet.setAttribute('media', 'print');
document.documentElement.firstChild.insertBefore(printStyleSheet, document.documentElement.firstChild.firstChild);
printStyleSheet=printStyleSheet.styleSheet;
printStyleSheet.addRule(this.ns + '\\:*', '{display: none !important;}');
printStyleSheet.addRule('img.' + this.ns + '_sizeFinder', '{display: none !important;}');
}
},
readPropertyChange: function () {
var el, display, v;
el=event.srcElement;
if (!el.vmlInitiated) {
return;
}
if (event.propertyName.search('background') !=-1 || event.propertyName.search('border') !=-1) {
DD_belatedPNG.applyVML(el);
}
if (event.propertyName=='style.display') {
display=(el.currentStyle.display=='none') ? 'none' : 'block';
for (v in el.vml) {
if (el.vml.hasOwnProperty(v)) {
el.vml[v].shape.style.display=display;
}
}
}
if (event.propertyName.search('filter') !=-1) {
DD_belatedPNG.vmlOpacity(el);
}
},
vmlOpacity: function (el) {
if (el.currentStyle.filter.search('lpha') !=-1) {
var trans=el.currentStyle.filter;
trans=parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100;
el.vml.color.shape.style.filter=el.currentStyle.filter; /* complete guesswork */
el.vml.image.fill.opacity=trans; /* complete guesswork */
}
},
handlePseudoHover: function (el) {
setTimeout(function () { /* wouldn't work as intended without setTimeout */
DD_belatedPNG.applyVML(el);
}, 1);
},
/**
* This is the method to use in a document.
* @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
**/
fix: function (selector) {
if (this.screenStyleSheet) {
var selectors, i;
selectors=selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */
for (i=0; i<selectors.length; i++) {
this.screenStyleSheet.addRule(selectors[i], 'behavior:expression(DD_belatedPNG.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */
}
}
},
applyVML: function (el) {
el.runtimeStyle.cssText='';
this.vmlFill(el);
this.vmlOffsets(el);
this.vmlOpacity(el);
if (el.isImg) {
this.copyImageBorders(el);
}
},
attachHandlers: function (el) {
var self, handlers, handler, moreForAs, a, h;
self=this;
handlers={resize: 'vmlOffsets', move: 'vmlOffsets'};
if (el.nodeName=='A') {
moreForAs={mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'};
for (a in moreForAs) {
if (moreForAs.hasOwnProperty(a)) {
handlers[a]=moreForAs[a];
}
}
}
for (h in handlers) {
if (handlers.hasOwnProperty(h)) {
handler=function () {
self[handlers[h]](el);
};
el.attachEvent('on' + h, handler);
}
}
el.attachEvent('onpropertychange', this.readPropertyChange);
},
giveLayout: function (el) {
el.style.zoom=1;
if (el.currentStyle.position=='static') {
el.style.position='relative';
}
},
copyImageBorders: function (el) {
var styles, s;
styles={'borderStyle':true, 'borderWidth':true, 'borderColor':true};
for (s in styles) {
if (styles.hasOwnProperty(s)) {
el.vml.color.shape.style[s]=el.currentStyle[s];
}
}
},
vmlFill: function (el) {
if (!el.currentStyle) {
return;
} else {
var elStyle, noImg, lib, v, img, imgLoaded;
elStyle=el.currentStyle;
}
for (v in el.vml) {
if (el.vml.hasOwnProperty(v)) {
el.vml[v].shape.style.zIndex=elStyle.zIndex;
}
}
el.runtimeStyle.backgroundColor='';
el.runtimeStyle.backgroundImage='';
noImg=true;
if (elStyle.backgroundImage !='none' || el.isImg) {
if (!el.isImg) {
el.vmlBg=elStyle.backgroundImage;
el.vmlBg=el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5);
}
else {
el.vmlBg=el.src;
}
lib=this;
if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
img=document.createElement('img');
lib.imgSize[el.vmlBg]=img;
img.className=lib.ns + '_sizeFinder';
img.runtimeStyle.cssText='behavior:none; position:absolute; left:-10000px; top:-10000px; border:none; margin:0; padding:0;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
imgLoaded=function () {
this.width=this.offsetWidth; /* weird cache-busting requirement! */
this.height=this.offsetHeight;
lib.vmlOffsets(el);
};
img.attachEvent('onload', imgLoaded);
img.src=el.vmlBg;
img.removeAttribute('width');
img.removeAttribute('height');
document.body.insertBefore(img, document.body.firstChild);
}
el.vml.image.fill.src=el.vmlBg;
noImg=false;
}
el.vml.image.fill.on=!noImg;
el.vml.image.fill.color='none';
el.vml.color.shape.style.backgroundColor=elStyle.backgroundColor;
el.runtimeStyle.backgroundImage='none';
el.runtimeStyle.backgroundColor='transparent';
},
/* IE can't figure out what do when the offsetLeft and the clientLeft add up to 1, and the VML ends up getting fuzzy... so we have to push/enlarge things by 1 pixel and then clip off the excess */
vmlOffsets: function (el) {
var thisStyle, size, fudge, makeVisible, bg, bgR, dC, altC, b, c, v;
thisStyle=el.currentStyle;
size={'W':el.clientWidth+1, 'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width, 'h':this.imgSize[el.vmlBg].height, 'L':el.offsetLeft, 'T':el.offsetTop, 'bLW':el.clientLeft, 'bTW':el.clientTop};
fudge=(size.L + size.bLW==1) ? 1 : 0;
/* vml shape, left, top, width, height, origin */
makeVisible=function (vml, l, t, w, h, o) {
vml.coordsize=w+','+h;
vml.coordorigin=o+','+o;
vml.path='m0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe';
vml.style.width=w + 'px';
vml.style.height=h + 'px';
vml.style.left=l + 'px';
vml.style.top=t + 'px';
};
makeVisible(el.vml.color.shape, (size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 : size.bTW)), (size.W-1), (size.H-1), 0);
makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1 );
bg={'X':0, 'Y':0};
if (el.isImg) {
bg.X=parseInt(thisStyle.paddingLeft, 10) + 1;
bg.Y=parseInt(thisStyle.paddingTop, 10) + 1;
}
else {
for (b in bg) {
if (bg.hasOwnProperty(b)) {
this.figurePercentage(bg, size, b, thisStyle['backgroundPosition'+b]);
}
}
}
el.vml.image.fill.position=(bg.X/size.W) + ',' + (bg.Y/size.H);
bgR=thisStyle.backgroundRepeat;
dC={'T':1, 'R':size.W+fudge, 'B':size.H, 'L':1+fudge}; /* these are defaults for repeat of any kind */
altC={ 'X': {'b1': 'L', 'b2': 'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
if (bgR !='repeat' || el.isImg) {
c={'T':(bg.Y), 'R':(bg.X+size.w), 'B':(bg.Y+size.h), 'L':(bg.X)}; /* these are defaults for no-repeat - clips down to the image location */
if (bgR.search('repeat-') !=-1) { /* now let's revert to dC for repeat-x or repeat-y */
v=bgR.split('repeat-')[1].toUpperCase();
c[altC[v].b1]=1;
c[altC[v].b2]=size[altC[v].d];
}
if (c.B > size.H) {
c.B=size.H;
}
el.vml.image.shape.style.clip='rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px '+(c.L+fudge)+'px)';
}
else {
el.vml.image.shape.style.clip='rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)';
}
},
figurePercentage: function (bg, size, axis, position) {
var horizontal, fraction;
fraction=true;
horizontal=(axis=='X');
switch(position) {
case 'left':
case 'top':
bg[axis]=0;
break;
case 'center':
bg[axis]=0.5;
break;
case 'right':
case 'bottom':
bg[axis]=1;
break;
default:
if (position.search('%') !=-1) {
bg[axis]=parseInt(position, 10) / 100;
}
else {
fraction=false;
}
}
bg[axis]=Math.ceil( fraction ? ( (size[horizontal?'W': 'H'] * bg[axis]) - (size[horizontal?'w': 'h'] * bg[axis]) ) : parseInt(position, 10) );
if (bg[axis] % 2===0) {
bg[axis]++;
}
return bg[axis];
},
fixPng: function (el) {
el.style.behavior='none';
var lib, els, nodeStr, v, e;
if (el.nodeName=='BODY' || el.nodeName=='TD' || el.nodeName=='TR') { /* elements not supported yet */
return;
}
el.isImg=false;
if (el.nodeName=='IMG') {
if(el.src.toLowerCase().search(/\.png$/) !=-1) {
el.isImg=true;
el.style.visibility='hidden';
}
else {
return;
}
}
else if (el.currentStyle.backgroundImage.toLowerCase().search('.png')==-1) {
return;
}
lib=DD_belatedPNG;
el.vml={color: {}, image: {}};
els={shape: {}, fill: {}};
for (v in el.vml) {
if (el.vml.hasOwnProperty(v)) {
for (e in els) {
if (els.hasOwnProperty(e)) {
nodeStr=lib.ns + ':' + e;
el.vml[v][e]=document.createElement(nodeStr);
}
}
el.vml[v].shape.stroked=false;
el.vml[v].shape.appendChild(el.vml[v].fill);
el.parentNode.insertBefore(el.vml[v].shape, el);
}
}
el.vml.image.shape.fillcolor='none'; /* Don't show blank white shapeangle when waiting for image to load. */
el.vml.image.fill.type='tile'; /* Makes image show up. */
el.vml.color.fill.on=false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
lib.attachHandlers(el);
lib.giveLayout(el);
lib.giveLayout(el.offsetParent);
el.vmlInitiated=true;
lib.applyVML(el); /* Render! */
}
};
try {
document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */
} catch(r) {}
DD_belatedPNG.createVmlNameSpace();
DD_belatedPNG.createVmlStyleSheet();
效果圖:
1.1 onblur和onfocus
馬克-to-win:onblur失去焦點和onfocus得到焦點事件。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<SCRIPT LANGUAGE="JavaScript">
<!--
function check(a)
{
var username=a.value;
if (username=="")
{
/*String.fontcolor() (Method)
Encapsulates the string within an <FONT COLOR="..."> tag context.*/
document.getElementById("error").innerHTML="用戶名不能為空!".fontcolor("red");
}
}
function rese()
{
document.getElementById("error").innerHTML="";
}
//-->
</SCRIPT>
</HEAD>
<BODY onload="document.getElementById('u').focus()">
篇幅有限更多請見擴展鏈接:http://www.mark-to-win.com/tutorial/js_4_onbluronfocus.html「鏈接」
盒模型重置,使盒子的寬度和高度不受其邊框(border)或填充(padding)的影響。
HTML
<div class="box">border-box</div><div class="box content-box">content-box</div>
CSS
html { box-sizing: border-box;}*,*::before,*::after { box-sizing: inherit;}.box { display: inline-block; width: 150px; height: 150px; padding: 10px; background: tomato; color: white; border: 10px solid red;}.content-box { box-sizing: content-box;}
DEMO
可在 CodePen 上查看真實效果和編輯代碼
說明
瀏覽器支持情況
99.9% 查看本條 caniuse
無需借助輔助元素進行浮動的清除。
注意:這僅在使用float布局時才有用。實際場景中請考慮使用Flexbox布局或者網格布局。
HTML
<div class="clearfix"> <div class="floated">float a</div> <div class="floated">float b</div> <div class="floated">float c</div></div>
CSS
.clearfix{ border:solid 1px red;}.clearfix::after { content: ''; display: block; clear: both;}.floated { float: left; margin-left:20px;}
DEMO
可在 CodePen 上查看真實效果和編輯代碼
瀏覽器支持情況
100%
我自己是一名從事了多年開發的web前端老程序員,目前辭職在做自己的web前端私人定制課程,今年年初我花了一個月整理了一份最適合2019年學習的web前端學習干貨,各種框架都有整理,送給每一位前端小伙伴,想要獲取的可以關注我的頭條號并在后臺私信我:前端,即可免費獲取。
給定寬度可變的元素,它將確保其高度以響應方式保持成比例(即,其寬高比保持不變)。
DEMO
可在 CodePen 上查看真實效果和編輯代碼
HTML
<div class="constant-width-to-height-ratio"></div>
CSS
.constant-width-to-height-ratio { background: #333; width: 50%;}.constant-width-to-height-ratio::before { content: ''; padding-top: 100%; float: left;}.constant-width-to-height-ratio::after { content: ''; display: block; clear: both;}
說明
瀏覽器支持情況
100%
使用display:table(作為flexbox的替代)使子元素在其父元素中水平垂直居。
HTML
<div class="container"> <div class="center"><span>Centered content</span></div></div>
CSS
.container { border: 1px solid #333; height: 250px; width: 250px;}.center { display: table; height: 100%; width: 100%;}.center > span { display: table-cell; text-align: center; vertical-align: middle;}
DEMO
可在 CodePen 上查看真實效果和編輯代碼
原文鏈接:https://mp.weixin.qq.com/s/Pw3VgFpijTYRkJyYPvlJgA
作者:前端技術江湖
*請認真填寫需求信息,我們會在24小時內與您取得聯系。