通过CSS3实现的精美折角特效代码

发布时间：2014-07-28 11:39:20　来源/作者：学技巧网页制作　分类：CSS样式阅读：0次点评一下

<!DOCTYPE html> <html> <head> <meta charset="UTF-8">  <title>CSS3 折角效果演示 by www.xuejiqiao.com</title> <style>@import url(http://fonts.googleapis.com/css?family=Oswald:400,300); div { width: 200px; height: 200px; padding: 10px; border: 1px solid #ddd; background-size: cover; background-clip: content-box; background-color: #f66f6f; box-sizing: border-box; position: relative; margin: auto; top: 30px; font: 400 2em/180px 'Oswald', sans-serif; color: #fbfbfb; text-indent: 20px; } div:after { content: ""; display: block; position: absolute; border: 50px solid transparent; border-bottom: 50px solid #fefefe; bottom: -60px; right: -65px; box-shadow: 0px 7px 6px -9px black; transform: rotate(135deg); } div:before { content: ""; display: block; position: absolute; border: 50px solid transparent; border-top: 50px solid #fefefe; top: -60px; left: -65px; box-shadow: 0px -7px 6px -9px black; transform: rotate(135deg); }</style> <script> window.confirm = function(){}; window.prompt = function(){}; window.open = function(){}; window.print = function(){}; // Support hover state for mobile. if (false) { window.ontouchstart = function(){}; } </script> <script>/** * StyleFix 1.0.3 & PrefixFree 1.0.7 * @author Lea Verou * MIT license */ (function(){ if(!window.addEventListener) { return; } var self = window.StyleFix = { link: function(link) { try { // Ignore stylesheets with data-noprefix attribute as well as alternate stylesheets if(link.rel !== 'stylesheet' || link.hasAttribute('data-noprefix')) { return; } } catch(e) { return; } var url = link.href || link.getAttribute('data-href'), base = url.replace(/[^\/]+$/, ''), base_scheme = (/^[a-z]{3,10}:/.exec(base) || [''])[0], base_domain = (/^[a-z]{3,10}:\/\/[^\/]+/.exec(base) || [''])[0], base_query = /^([^?]*)\??/.exec(url)[1], parent = link.parentNode, xhr = new XMLHttpRequest(), process; xhr.onreadystatechange = function() { if(xhr.readyState === 4) { process(); } }; process = function() { var css = xhr.responseText; if(css && link.parentNode && (!xhr.status || xhr.status < 400 || xhr.status > 600)) { css = self.fix(css, true, link); // Convert relative URLs to absolute, if needed if(base) { css = css.replace(/url$\s*?((?:"|')?)(.+?)\1\s*?$/gi, function($0, quote, url) { if(/^([a-z]{3,10}:|#)/i.test(url)) { // Absolute & or hash-relative return $0; } else if(/^\/\//.test(url)) { // Scheme-relative // May contain sequences like /../ and /./ but those DO work return 'url("' + base_scheme + url + '")'; } else if(/^\//.test(url)) { // Domain-relative return 'url("' + base_domain + url + '")'; } else if(/^\?/.test(url)) { // Query-relative return 'url("' + base_query + url + '")'; } else { // Path-relative return 'url("' + base + url + '")'; } }); // behavior URLs shoudn't be converted (Issue #19) // base should be escaped before added to RegExp (Issue #81) var escaped_base = base.replace(/([\\\^\$*+[\]?{}.=!:(|)])/g,"\\$1"); css = css.replace(RegExp('\\b(behavior:\\s*?url\\(\'?"?)' + escaped_base, 'gi'), '$1'); } var style = document.createElement('style'); style.textContent = css; style.media = link.media; style.disabled = link.disabled; style.setAttribute('data-href', link.getAttribute('href')); parent.insertBefore(style, link); parent.removeChild(link); style.media = link.media; // Duplicate is intentional. See issue #31 } }; try { xhr.open('GET', url); xhr.send(null); } catch (e) { // Fallback to XDomainRequest if available if (typeof XDomainRequest != "undefined") { xhr = new XDomainRequest(); xhr.onerror = xhr.onprogress = function() {}; xhr.onload = process; xhr.open("GET", url); xhr.send(null); } } link.setAttribute('data-inprogress', ''); }, styleElement: function(style) { if (style.hasAttribute('data-noprefix')) { return; } var disabled = style.disabled; style.textContent = self.fix(style.textContent, true, style); style.disabled = disabled; }, styleAttribute: function(element) { var css = element.getAttribute('style'); css = self.fix(css, false, element); element.setAttribute('style', css); }, process: function() { // Linked stylesheets $('link[rel="stylesheet"]:not([data-inprogress])').forEach(StyleFix.link); // Inline stylesheets $('style').forEach(StyleFix.styleElement); // Inline styles $('[style]').forEach(StyleFix.styleAttribute); }, register: function(fixer, index) { (self.fixers = self.fixers || []) .splice(index === undefined? self.fixers.length : index, 0, fixer); }, fix: function(css, raw, element) { for(var i=0; i<self.fixers.length; i++) { css = self.fixers[i](css, raw, element) || css; } return css; }, camelCase: function(str) { return str.replace(/-([a-z])/g, function($0, $1) { return $1.toUpperCase(); }).replace('-',''); }, deCamelCase: function(str) { return str.replace(/[A-Z]/g, function($0) { return '-' + $0.toLowerCase() }); } }; /************************************** * Process styles **************************************/ (function(){ setTimeout(function(){ $('link[rel="stylesheet"]').forEach(StyleFix.link); }, 10); document.addEventListener('DOMContentLoaded', StyleFix.process, false); })(); function $(expr, con) { return [].slice.call((con || document).querySelectorAll(expr)); } })(); /** * PrefixFree */ (function(root){ if(!window.StyleFix || !window.getComputedStyle) { return; } // Private helper function fix(what, before, after, replacement, css) { what = self[what]; if(what.length) { var regex = RegExp(before + '(' + what.join('|') + ')' + after, 'gi'); css = css.replace(regex, replacement); } return css; } var self = window.PrefixFree = { prefixCSS: function(css, raw, element) { var prefix = self.prefix; // Gradient angles hotfix if(self.functions.indexOf('linear-gradient') > -1) { // Gradients are supported with a prefix, convert angles to legacy css = css.replace(/(\s|:|,)(repeating-)?linear-gradient\(\s*(-?\d*\.?\d*)deg/ig, function ($0, delim, repeating, deg) { return delim + (repeating || '') + 'linear-gradient(' + (90-deg) + 'deg'; }); } css = fix('functions', '(\\s|:|,)', '\\s*\\(', '$1' + prefix + '$2(', css); css = fix('keywords', '(\\s|:)', '(\\s|;|\\}|$)', '$1' + prefix + '$2$3', css); css = fix('properties', '(^|\\{|\\s|;)', '\\s*:', '$1' + prefix + '$2:', css); // Prefix properties *inside* values (issue #8) if (self.properties.length) { var regex = RegExp('\\b(' + self.properties.join('|') + ')(?!:)', 'gi'); css = fix('valueProperties', '\\b', ':(.+?);', function($0) { return $0.replace(regex, prefix + "$1") }, css); } if(raw) { css = fix('selectors', '', '\\b', self.prefixSelector, css); css = fix('atrules', '@', '\\b', '@' + prefix + '$1', css); } // Fix double prefixing css = css.replace(RegExp('-' + prefix, 'g'), '-'); // Prefix wildcard css = css.replace(/-\*-(?=[a-z]+)/gi, self.prefix); return css; }, property: function(property) { return (self.properties.indexOf(property)? self.prefix : '') + property; }, value: function(value, property) { value = fix('functions', '(^|\\s|,)', '\\s*\\(', '$1' + self.prefix + '$2(', value); value = fix('keywords', '(^|\\s)', '(\\s|$)', '$1' + self.prefix + '$2$3', value); // TODO properties inside values return value; }, // Warning: Prefixes no matter what, even if the selector is supported prefix-less prefixSelector: function(selector) { return selector.replace(/^:{1,2}/, function($0) { return $0 + self.prefix }) }, // Warning: Prefixes no matter what, even if the property is supported prefix-less prefixProperty: function(property, camelCase) { var prefixed = self.prefix + property; return camelCase? StyleFix.camelCase(prefixed) : prefixed; } }; /************************************** * Properties **************************************/ (function() { var prefixes = {}, properties = [], shorthands = {}, style = getComputedStyle(document.documentElement, null), dummy = document.createElement('div').style; // Why are we doing this instead of iterating over properties in a .style object? Cause Webkit won't iterate over those. var iterate = function(property) { if(property.charAt(0) === '-') { properties.push(property); var parts = property.split('-'), prefix = parts[1]; // Count prefix uses prefixes[prefix] = ++prefixes[prefix] || 1; // This helps determining shorthands while(parts.length > 3) { parts.pop(); var shorthand = parts.join('-'); if(supported(shorthand) && properties.indexOf(shorthand) === -1) { properties.push(shorthand); } } } }, supported = function(property) { return StyleFix.camelCase(property) in dummy; } // Some browsers have numerical indices for the properties, some don't if(style.length > 0) { for(var i=0; i<style.length; i++) { iterate(style[i]) } } else { for(var property in style) { iterate(StyleFix.deCamelCase(property)); } } // Find most frequently used prefix var highest = {uses:0}; for(var prefix in prefixes) { var uses = prefixes[prefix]; if(highest.uses < uses) { highest = {prefix: prefix, uses: uses}; } } self.prefix = '-' + highest.prefix + '-'; self.Prefix = StyleFix.camelCase(self.prefix); self.properties = []; // Get properties ONLY supported with a prefix for(var i=0; i<properties.length; i++) { var property = properties[i]; if(property.indexOf(self.prefix) === 0) { // we might have multiple prefixes, like Opera var unprefixed = property.slice(self.prefix.length); if(!supported(unprefixed)) { self.properties.push(unprefixed); } } } // IE fix if(self.Prefix == 'Ms' && !('transform' in dummy) && !('MsTransform' in dummy) && ('msTransform' in dummy)) { self.properties.push('transform', 'transform-origin'); } self.properties.sort(); })(); /************************************** * Values **************************************/ (function() { // Values that might need prefixing var functions = { 'linear-gradient': { property: 'backgroundImage', params: 'red, teal' }, 'calc': { property: 'width', params: '1px + 5%' }, 'element': { property: 'backgroundImage', params: '#foo' }, 'cross-fade': { property: 'backgroundImage', params: 'url(a.png), url(b.png), 50%' } }; functions['repeating-linear-gradient'] = functions['repeating-radial-gradient'] = functions['radial-gradient'] = functions['linear-gradient']; // Note: The properties assigned are just to *test* support. // The keywords will be prefixed everywhere. var keywords = { 'initial': 'color', 'zoom-in': 'cursor', 'zoom-out': 'cursor', 'box': 'display', 'flexbox': 'display', 'inline-flexbox': 'display', 'flex': 'display', 'inline-flex': 'display', 'grid': 'display', 'inline-grid': 'display', 'min-content': 'width' }; self.functions = []; self.keywords = []; var style = document.createElement('div').style; function supported(value, property) { style[property] = ''; style[property] = value; return !!style[property]; } for (var func in functions) { var test = functions[func], property = test.property, value = func + '(' + test.params + ')'; if (!supported(value, property) && supported(self.prefix + value, property)) { // It's supported, but with a prefix self.functions.push(func); } } for (var keyword in keywords) { var property = keywords[keyword]; if (!supported(keyword, property) && supported(self.prefix + keyword, property)) { // It's supported, but with a prefix self.keywords.push(keyword); } } })(); /************************************** * Selectors and @-rules **************************************/ (function() { var selectors = { ':read-only': null, ':read-write': null, ':any-link': null, '::selection': null }, atrules = { 'keyframes': 'name', 'viewport': null, 'document': 'regexp(".")' }; self.selectors = []; self.atrules = []; var style = root.appendChild(document.createElement('style')); function supported(selector) { style.textContent = selector + '{}'; // Safari 4 has issues with style.innerHTML return !!style.sheet.cssRules.length; } for(var selector in selectors) { var test = selector + (selectors[selector]? '(' + selectors[selector] + ')' : ''); if(!supported(test) && supported(self.prefixSelector(test))) { self.selectors.push(selector); } } for(var atrule in atrules) { var test = atrule + ' ' + (atrules[atrule] || ''); if(!supported('@' + test) && supported('@' + self.prefix + test)) { self.atrules.push(atrule); } } root.removeChild(style); })(); // Properties that accept properties as their value self.valueProperties = [ 'transition', 'transition-property' ] // Add class for current prefix root.className += ' ' + self.prefix; StyleFix.register(self.prefixCSS); })(document.documentElement);</script> </head> <body> <div>xuejiqiao</div> <script> </script> <script> if (document.location.search.match(/type=embed/gi)) { window.parent.postMessage('resize', "*"); } </script> </body> </html>

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通过CSS3实现的精美折角特效代码