如何让IE 低版本下支持 css3属性

时间:2022-02-28 07:00:41

依赖源  该文件为  ie-css3.htc    (特别提示.htc为二进制文件,只会在ie中识别,让IE浏览器支持CSS3的一些属性)

以下为依赖文件源码

  通过源码我们可以看到 该文件在一定程度上类似于我们所使用的javascrip

--Do not remove this if you are using--
Original Author: Remiz Rahnas
Original Author URL: http://www.htmlremix.com
Published date: 2008/09/24 Changes by Nick Fetchak:
- IE8 standards mode compatibility
- VML elements now positioned behind original box rather than inside of it - should be less prone to breakage
- Added partial support for 'box-shadow' style
- Checks for VML support before doing anything
- Updates VML element size and position via timer and also via window resize event
- lots of other small things
Published date : 2010/03/14
http://fetchak.com/ie-css3 Thanks to TheBrightLines.com (http://www.thebrightlines.com/2009/12/03/using-ies-filter-in-a-cross-browser-way) for enlightening me about the DropShadow filter <public:attach event="ondocumentready" onevent="ondocumentready('v08vnSVo78t4JfjH')" />
<script type="text/javascript"> timer_length = 200; // Milliseconds
border_opacity = false; // Use opacity on borders of rounded-corner elements? Note: This causes antialiasing issues // supportsVml() borrowed from http://*.com/questions/654112/how-do-you-detect-support-for-vml-or-svg-in-a-browser
function supportsVml() {
if (typeof supportsVml.supported == "undefined") {
var a = document.body.appendChild(document.createElement('div'));
a.innerHTML = '<v:shape id="vml_flag1" adj="1" />';
var b = a.firstChild;
b.style.behavior = "url(#default#VML)";
supportsVml.supported = b ? typeof b.adj == "object": true;
a.parentNode.removeChild(a);
}
return supportsVml.supported
} // findPos() borrowed from http://www.quirksmode.org/js/findpos.html
function findPos(obj) {
var curleft = curtop = 0; if (obj.offsetParent) {
do {
curleft += obj.offsetLeft;
curtop += obj.offsetTop;
} while (obj = obj.offsetParent);
} return({
'x': curleft,
'y': curtop
});
} function createBoxShadow(element, vml_parent) {
var style = element.currentStyle['iecss3-box-shadow'] || element.currentStyle['-moz-box-shadow'] || element.currentStyle['-webkit-box-shadow'] || element.currentStyle['box-shadow'] || '';
var match = style.match(/^(\d+)px (\d+)px (\d+)px/);
if (!match) { return(false); } var shadow = document.createElement('v:roundrect');
shadow.userAttrs = {
'x': parseInt(RegExp.$1 || 0),
'y': parseInt(RegExp.$2 || 0),
'radius': parseInt(RegExp.$3 || 0) / 2
};
shadow.position_offset = {
'y': (0 - vml_parent.pos_ieCSS3.y - shadow.userAttrs.radius + shadow.userAttrs.y),
'x': (0 - vml_parent.pos_ieCSS3.x - shadow.userAttrs.radius + shadow.userAttrs.x)
};
shadow.size_offset = {
'width': 0,
'height': 0
};
shadow.arcsize = element.arcSize +'px';
shadow.style.display = 'block';
shadow.style.position = 'absolute';
shadow.style.top = (element.pos_ieCSS3.y + shadow.position_offset.y) +'px';
shadow.style.left = (element.pos_ieCSS3.x + shadow.position_offset.x) +'px';
shadow.style.width = element.offsetWidth +'px';
shadow.style.height = element.offsetHeight +'px';
shadow.style.antialias = true;
shadow.className = 'vml_box_shadow';
shadow.style.zIndex = element.zIndex - 1;
shadow.style.filter = 'progid:DXImageTransform.Microsoft.Blur(pixelRadius='+ shadow.userAttrs.radius +',makeShadow=true,shadowOpacity='+ element.opacity +')'; element.parentNode.appendChild(shadow);
//element.parentNode.insertBefore(shadow, element.element); // For window resizing
element.vml.push(shadow); return(true);
} function createBorderRect(element, vml_parent) {
if (isNaN(element.borderRadius)) { return(false); } element.style.background = 'transparent';
element.style.borderColor = 'transparent'; var rect = document.createElement('v:roundrect');
rect.position_offset = {
'y': (0.5 * element.strokeWeight) - vml_parent.pos_ieCSS3.y,
'x': (0.5 * element.strokeWeight) - vml_parent.pos_ieCSS3.x
};
rect.size_offset = {
'width': 0 - element.strokeWeight,
'height': 0 - element.strokeWeight
};
rect.arcsize = element.arcSize +'px';
rect.strokeColor = element.strokeColor;
rect.strokeWeight = element.strokeWeight +'px';
rect.stroked = element.stroked;
rect.className = 'vml_border_radius';
rect.style.display = 'block';
rect.style.position = 'absolute';
rect.style.top = (element.pos_ieCSS3.y + rect.position_offset.y) +'px';
rect.style.left = (element.pos_ieCSS3.x + rect.position_offset.x) +'px';
rect.style.width = (element.offsetWidth + rect.size_offset.width) +'px';
rect.style.height = (element.offsetHeight + rect.size_offset.height) +'px';
rect.style.antialias = true;
rect.style.zIndex = element.zIndex - 1; if (border_opacity && (element.opacity < 1)) {
rect.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(Opacity='+ parseFloat(element.opacity * 100) +')';
} var fill = document.createElement('v:fill');
fill.color = element.fillColor;
fill.src = element.fillSrc;
fill.className = 'vml_border_radius_fill';
fill.type = 'tile';
fill.opacity = element.opacity; // Hack: IE6 doesn't support transparent borders, use padding to offset original element
isIE6 = /msie|MSIE 6/.test(navigator.userAgent);
if (isIE6 && (element.strokeWeight > 0)) {
element.style.borderStyle = 'none';
element.style.paddingTop = parseInt(element.currentStyle.paddingTop || 0) + element.strokeWeight;
element.style.paddingBottom = parseInt(element.currentStyle.paddingBottom || 0) + element.strokeWeight;
} rect.appendChild(fill);
element.parentNode.appendChild(rect);
//element.parentNode.insertBefore(rect, element.element); // For window resizing
element.vml.push(rect); return(true);
} function createTextShadow(element, vml_parent) {
if (!element.textShadow) { return(false); } var match = element.textShadow.match(/^(\d+)px (\d+)px (\d+)px (#?\w+)/);
if (!match) { return(false); } //var shadow = document.createElement('span');
var shadow = element.cloneNode(true);
var radius = parseInt(RegExp.$3 || 0);
shadow.userAttrs = {
'x': parseInt(RegExp.$1 || 0) - (radius),
'y': parseInt(RegExp.$2 || 0) - (radius),
'radius': radius / 2,
'color': (RegExp.$4 || '#000')
};
shadow.position_offset = {
'y': (0 - vml_parent.pos_ieCSS3.y + shadow.userAttrs.y),
'x': (0 - vml_parent.pos_ieCSS3.x + shadow.userAttrs.x)
};
shadow.size_offset = {
'width': 0,
'height': 0
};
shadow.style.color = shadow.userAttrs.color;
shadow.style.position = 'absolute';
shadow.style.top = (element.pos_ieCSS3.y + shadow.position_offset.y) +'px';
shadow.style.left = (element.pos_ieCSS3.x + shadow.position_offset.x) +'px';
shadow.style.antialias = true;
shadow.style.behavior = null;
shadow.className = 'ieCSS3_text_shadow';
shadow.innerHTML = element.innerHTML;
// For some reason it only looks right with opacity at 75%
shadow.style.filter = '\
progid:DXImageTransform.Microsoft.Alpha(Opacity=75)\
progid:DXImageTransform.Microsoft.Blur(pixelRadius='+ shadow.userAttrs.radius +',makeShadow=false,shadowOpacity=100)\
'; var clone = element.cloneNode(true);
clone.position_offset = {
'y': (0 - vml_parent.pos_ieCSS3.y),
'x': (0 - vml_parent.pos_ieCSS3.x)
};
clone.size_offset = {
'width': 0,
'height': 0
};
clone.style.behavior = null;
clone.style.position = 'absolute';
clone.style.top = (element.pos_ieCSS3.y + clone.position_offset.y) +'px';
clone.style.left = (element.pos_ieCSS3.x + clone.position_offset.x) +'px';
clone.className = 'ieCSS3_text_shadow'; element.parentNode.appendChild(shadow);
element.parentNode.appendChild(clone); element.style.visibility = 'hidden'; // For window resizing
element.vml.push(clone);
element.vml.push(shadow); return(true);
} function ondocumentready(classID) {
if (!supportsVml()) { return(false); } if (this.className.match(classID)) { return(false); }
this.className = this.className.concat(' ', classID); // Add a namespace for VML (IE8 requires it)
if (!document.namespaces.v) { document.namespaces.add("v", "urn:schemas-microsoft-com:vml"); } // Check to see if we've run once before on this page
if (typeof(window.ieCSS3) == 'undefined') {
// Create global ieCSS3 object
window.ieCSS3 = {
'vmlified_elements': new Array(),
'update_timer': setInterval(updatePositionAndSize, timer_length)
}; if (typeof(window.onresize) == 'function') { window.ieCSS3.previous_onresize = window.onresize; } // Attach window resize event
window.onresize = updatePositionAndSize;
} // These attrs are for the script and have no meaning to the browser:
this.borderRadius = parseInt(this.currentStyle['iecss3-border-radius'] ||
this.currentStyle['-moz-border-radius'] ||
this.currentStyle['-webkit-border-radius'] ||
this.currentStyle['border-radius'] ||
this.currentStyle['-khtml-border-radius']);
this.arcSize = Math.min(this.borderRadius / Math.min(this.offsetWidth, this.offsetHeight), 1);
this.fillColor = this.currentStyle.backgroundColor;
this.fillSrc = this.currentStyle.backgroundImage.replace(/^url\("(.+)"\)$/, '$1');
this.strokeColor = this.currentStyle.borderColor;
this.strokeWeight = parseInt(this.currentStyle.borderWidth);
this.stroked = 'true';
if (isNaN(this.strokeWeight) || (this.strokeWeight == 0)) {
this.strokeWeight = 0;
this.strokeColor = fillColor;
this.stroked = 'false';
}
this.opacity = parseFloat(this.currentStyle.opacity || 1);
this.textShadow = this.currentStyle['text-shadow']; this.element.vml = new Array();
this.zIndex = parseInt(this.currentStyle.zIndex);
if (isNaN(this.zIndex)) { this.zIndex = 0; } // Find which element provides position:relative for the target element (default to BODY)
vml_parent = this;
var limit = 100, i = 0;
do {
vml_parent = vml_parent.parentElement;
i++;
if (i >= limit) { return(false); }
} while ((typeof(vml_parent) != 'undefined') && (vml_parent.currentStyle.position != 'relative') && (vml_parent.tagName != 'BODY')); vml_parent.pos_ieCSS3 = findPos(vml_parent);
this.pos_ieCSS3 = findPos(this); var rv1 = createBoxShadow(this, vml_parent);
var rv2 = createBorderRect(this, vml_parent);
var rv3 = createTextShadow(this, vml_parent);
if (rv1 || rv2 || rv3) { window.ieCSS3.vmlified_elements.push(this.element); } if (typeof(vml_parent.document.ieCSS3_stylesheet) == 'undefined') {
vml_parent.document.ieCSS3_stylesheet = vml_parent.document.createStyleSheet();
vml_parent.document.ieCSS3_stylesheet.addRule("v\\:roundrect", "behavior: url(#default#VML)");
vml_parent.document.ieCSS3_stylesheet.addRule("v\\:fill", "behavior: url(#default#VML)");
// Compatibility with IE7.js
vml_parent.document.ieCSS3_stylesheet.ie7 = true;
}
} function updatePositionAndSize() {
if (typeof(window.ieCSS3.vmlified_elements) != 'object') { return(false); } for (var i in window.ieCSS3.vmlified_elements) {
var el = window.ieCSS3.vmlified_elements[i]; if (typeof(el.vml) != 'object') { continue; } for (var z in el.vml) {
//var parent_pos = findPos(el.vml[z].parentNode);
var new_pos = findPos(el);
new_pos.x = (new_pos.x + el.vml[z].position_offset.x) + 'px';
new_pos.y = (new_pos.y + el.vml[z].position_offset.y) + 'px';
if (el.vml[z].style.left != new_pos.x) { el.vml[z].style.left = new_pos.x; }
if (el.vml[z].style.top != new_pos.y) { el.vml[z].style.top = new_pos.y; } var new_size = {
'width': parseInt(el.offsetWidth + el.vml[z].size_offset.width),
'height': parseInt(el.offsetHeight + el.vml[z].size_offset.height)
}
if (el.vml[z].offsetWidth != new_size.width) { el.vml[z].style.width = new_size.width +'px'; }
if (el.vml[z].offsetHeight != new_size.height) { el.vml[z].style.height = new_size.height +'px'; }
}
} if (event && (event.type == 'resize') && typeof(window.ieCSS3.previous_onresize) == 'function') { window.ieCSS3.previous_onresize(); }
}
</script>

示例代码:

俗话说的好书面描述的再好,都不如上手来段代码实践一波来的实际,当然该代码均为在本地环境下的实践,在低版本ie下的css3效果当然也不如符合W3C的正统css3展示的美观

  毕竟不是浏览器自带的属性,使用时遇到问题在所难免,这里说一下一些注意事项,也可以说是方法的局限性吧:

  1. 当前元素一定要有定位属性,像是position:relative或是position:absolute属性。
  2. z-index值一定要比周围元素的要高,否则……只能说抱歉了~~
  3. http协议访问。
  4. 原生IE浏览器访问,兼容模式显示可能没效果。
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>低版本ie-支持css3</title>
<style>
body {
background: #fff;
} .box {
background: #f8f8f8;
/* 通知IE浏览器调用脚本作用于'box'类 */
behavior: url(htc-css3.htc);
/* 现代浏览器以及使用了IE-CSS3的IE浏览器 */
border-radius: 15px;
/* 现代浏览器以及使用了IE-CSS3的IE浏览器 */
box-shadow: 2px 2px 8px #000;
display: inline-block;
padding: 10px;
height: 60px;
} </style>
</head> <body>
<div class="box">
看到一本书里的一句话,大意是:“如果你满脑子都是一个人,你会发现你们之间有很多巧合,所有那些被你认为是心有灵犀的事件都只是你太刻意的关注罢了”。
<br>
有人说:“遇见爱,遇见性,都不算难,难得是遇见了解,爱可以是一见钟情,性只需要几分钟,而了解可能需要一辈子。”
<br>
知道我看到一本书觉得在精神上无比的契合,我记得原话是“一段好的爱情,不是互相占有,而是共同成长。”
</div>
</body> </html>

通过源码我们可以清晰的看到这份htc文件所支持的css属性(如下表)【当然我们也可以自己通过对源码的拓展来创建自己需要的兼容css3的代码】

样式 生效 无效
border-radius 为元素四个角设置圆角属性
元素边框
只设置一个角落的圆角属性
box-shadow 模糊大小参数
偏移值
不支持除了黑色(#000)以外的其他颜色
text-shadow 模糊大小参数
偏移值
颜色值
IE下的表现与Firefox/Safari/Chrome有一点点的差异,原因不详