問題：IE8/9不支持Array.indexOf 解決方案 if (!Array.prototype.indexOf) { Array.prototype.indexOf = function(elt /*, from*/) { var len = this.length >>> 0; var fr
問題：IE8/9不支持Array.indexOf
解決方案
if (!Array.prototype.indexOf) { Array.prototype.indexOf = function(elt /*, from*/) { var len = this.length >>> 0; var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); if (from < 0) from += len; for (; from < len; from++) { if (from in this && this[from] === elt) return from; } return -1; }; }View Code
問題：IE8-不支持canvas
解決方案：引入excanvas.js。但是有一些註意事項參考http://rockyuse.iteye.com/blog/1618298
主要的註意事項有：
1.必須在canvas標簽載入完成後再引入excanvas.js
2.與jquery混合使用的時候必須使用jquery1.7以上的版本
問題：IE8-不支持css媒體查詢
解決方案，引入respond.js
我把上面三個IE支持放在一起命名為Array.indexOf_excanvas_respond.js
/*! 解決IE8不支持數組的indexOf方法的處理，需要放在所有js的開頭 */ if (!Array.prototype.indexOf) { Array.prototype.indexOf = function(elt /*, from*/) { var len = this.length >>> 0; var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); if (from < 0) from += len; for (; from < len; from++) { if (from in this && this[from] === elt) return from; } return -1; }; } //Copyright 2006 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Known Issues: // // * Patterns only support repeat. // * Radial gradient are not implemented. The VML version of these look very // different from the canvas one. // * Clipping paths are not implemented. // * Coordsize. The width and height attribute have higher priority than the // width and height style values which isn't correct. // * Painting mode isn't implemented. // * Canvas width/height should is using content-box by default. IE in // Quirks mode will draw the canvas using border-box. Either change your // doctype to HTML5 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) // or use Box Sizing Behavior from WebFX // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) // * Non uniform scaling does not correctly scale strokes. // * Optimize. There is always room for speed improvements. // Only add this code if we do not already have a canvas implementation if (!document.createElement('canvas').getContext) { (function() { // alias some functions to make (compiled) code shorter var m = Math; var mr = m.round; var ms = m.sin; var mc = m.cos; var abs = m.abs; var sqrt = m.sqrt; // this is used for sub pixel precision var Z = 10; var Z2 = Z / 2; var IE_VERSION = +navigator.userAgent.match(/MSIE ([\d.]+)?/)[1]; /** * This funtion is assigned to the <canvas> elements as element.getContext(). * @this {HTMLElement} * @return {CanvasRenderingContext2D_} */ function getContext() { return this.context_ || (this.context_ = new CanvasRenderingContext2D_(this)); } var slice = Array.prototype.slice; /** * Binds a function to an object. The returned function will always use the * passed in {@code obj} as {@code this}. * * Example: * * g = bind(f, obj, a, b) * g(c, d) // will do f.call(obj, a, b, c, d) * * @param {Function} f The function to bind the object to * @param {Object} obj The object that should act as this when the function * is called * @param {*} var_args Rest arguments that will be used as the initial * arguments when the function is called * @return {Function} A new function that has bound this */ function bind(f, obj, var_args) { var a = slice.call(arguments, 2); return function() { return f.apply(obj, a.concat(slice.call(arguments))); }; } function encodeHtmlAttribute(s) { return String(s).replace(/&/g, '&').replace(/"/g, '"'); } function addNamespace(doc, prefix, urn) { if (!doc.namespaces[prefix]) { doc.namespaces.add(prefix, urn, '#default#VML'); } } function addNamespacesAndStylesheet(doc) { addNamespace(doc, 'g_vml_', 'urn:schemas-microsoft-com:vml'); addNamespace(doc, 'g_o_', 'urn:schemas-microsoft-com:office:office'); // Setup default CSS. Only add one style sheet per document if (!doc.styleSheets['ex_canvas_']) { var ss = doc.createStyleSheet(); ss.owningElement.id = 'ex_canvas_'; ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + // default size is 300x150 in Gecko and Opera 'text-align:left;width:300px;height:150px}'; } } // Add namespaces and stylesheet at startup. addNamespacesAndStylesheet(document); var G_vmlCanvasManager_ = { init: function(opt_doc) { var doc = opt_doc || document; // Create a dummy element so that IE will allow canvas elements to be // recognized. doc.createElement('canvas'); doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); }, init_: function(doc) { // find all canvas elements var els = doc.getElementsByTagName('canvas'); for (var i = 0; i < els.length; i++) { this.initElement(els[i]); } }, /** * Public initializes a canvas element so that it can be used as canvas * element from now on. This is called automatically before the page is * loaded but if you are creating elements using createElement you need to * make sure this is called on the element. * @param {HTMLElement} el The canvas element to initialize. * @return {HTMLElement} the element that was created. */ initElement: function(el) { if (!el.getContext) { el.getContext = getContext; // Add namespaces and stylesheet to document of the element. addNamespacesAndStylesheet(el.ownerDocument); // Remove fallback content. There is no way to hide text nodes so we // just remove all childNodes. We could hide all elements and remove // text nodes but who really cares about the fallback content. el.innerHTML = ''; // do not use inline function because that will leak memory el.attachEvent('onpropertychange', onPropertyChange); el.attachEvent('onresize', onResize); var attrs = el.attributes; if (attrs.width && attrs.width.specified) { // TODO: use runtimeStyle and coordsize // el.getContext().setWidth_(attrs.width.nodeValue); el.style.width = attrs.width.nodeValue + 'px'; } else { el.width = el.clientWidth; } if (attrs.height && attrs.height.specified) { // TODO: use runtimeStyle and coordsize // el.getContext().setHeight_(attrs.height.nodeValue); el.style.height = attrs.height.nodeValue + 'px'; } else { el.height = el.clientHeight; } //el.getContext().setCoordsize_() } return el; } }; function onPropertyChange(e) { var el = e.srcElement; switch (e.propertyName) { case 'width': el.getContext().clearRect(); el.style.width = el.attributes.width.nodeValue + 'px'; // In IE8 this does not trigger onresize. el.firstChild.style.width = el.clientWidth + 'px'; break; case 'height': el.getContext().clearRect(); el.style.height = el.attributes.height.nodeValue + 'px'; el.firstChild.style.height = el.clientHeight + 'px'; break; } } function onResize(e) { var el = e.srcElement; if (el.firstChild) { el.firstChild.style.width = el.clientWidth + 'px'; el.firstChild.style.height = el.clientHeight + 'px'; } } G_vmlCanvasManager_.init(); // precompute "00" to "FF" var decToHex = []; for (var i = 0; i < 16; i++) { for (var j = 0; j < 16; j++) { decToHex[i * 16 + j] = i.toString(16) + j.toString(16); } } function createMatrixIdentity() { return [ [1, 0, 0], [0, 1, 0], [0, 0, 1] ]; } function matrixMultiply(m1, m2) { var result = createMatrixIdentity(); for (var x = 0; x < 3; x++) { for (var y = 0; y < 3; y++) { var sum = 0; for (var z = 0; z < 3; z++) { sum += m1[x][z] * m2[z][y]; } result[x][y] = sum; } } return result; } function copyState(o1, o2) { o2.fillStyle = o1.fillStyle; o2.lineCap = o1.lineCap; o2.lineJoin = o1.lineJoin; o2.lineWidth = o1.lineWidth; o2.miterLimit = o1.miterLimit; o2.shadowBlur = o1.shadowBlur; o2.shadowColor = o1.shadowColor; o2.shadowOffsetX = o1.shadowOffsetX; o2.shadowOffsetY = o1.shadowOffsetY; o2.strokeStyle = o1.strokeStyle; o2.globalAlpha = o1.globalAlpha; o2.font = o1.font; o2.textAlign = o1.textAlign; o2.textBaseline = o1.textBaseline; o2.arcScaleX_ = o1.arcScaleX_; o2.arcScaleY_ = o1.arcScaleY_; o2.lineScale_ = o1.lineScale_; } var colorData = { aliceblue: '#F0F8FF', antiquewhite: '#FAEBD7', aquamarine: '#7FFFD4', azure: '#F0FFFF', beige: '#F5F5DC', bisque: '#FFE4C4', black: '#000000', blanchedalmond: '#FFEBCD', blueviolet: '#8A2BE2', brown: '#A52A2A', burlywood: '#DEB887', cadetblue: '#5F9EA0', chartreuse: '#7FFF00', chocolate: '#D2691E', coral: '#FF7F50', cornflowerblue: '#6495ED', cornsilk: '#FFF8DC', crimson: '#DC143C', cyan: '#00FFFF', darkblue: '#00008B', darkcyan: '#008B8B', darkgoldenrod: '#B8860B', darkgray: '#A9A9A9', darkgreen: '#006400', darkgrey: '#A9A9A9', darkkhaki: '#BDB76B', darkmagenta: '#8B008B', darkolivegreen: '#556B2F', darkorange: '#FF8C00', darkorchid: '#9932CC', darkred: '#8B0000', darksalmon: '#E9967A', darkseagreen: '#8FBC8F', darkslateblue: '#483D8B', darkslategray: '#2F4F4F', darkslategrey: '#2F4F4F', darkturquoise: '#00CED1', darkviolet: '#9400D3', deeppink: '#FF1493', deepskyblue: '#00BFFF', dimgray: '#696969', dimgrey: '#696969', dodgerblue: '#1E90FF', firebrick: '#B22222', floralwhite: '#FFFAF0', forestgreen: '#228B22', gainsboro: '#DCDCDC', ghostwhite: '#F8F8FF', gold: '#FFD700', goldenrod: '#DAA520', grey: '#808080', greenyellow: '#ADFF2F', honeydew: '#F0FFF0', hotpink: '#FF69B4', indianred: '#CD5C5C', indigo: '#4B0082', ivory: '#FFFFF0', khaki: '#F0E68C', lavender: '#E6E6FA', lavenderblush: '#FFF0F5', lawngreen: '#7CFC00', lemonchiffon: '#FFFACD', lightblue: '#ADD8E6', lightcoral: '#F08080', lightcyan: '#E0FFFF', lightgoldenrodyellow: '#FAFAD2', lightgreen: '#90EE90', lightgrey: '#D3D3D3', lightpink: '#FFB6C1', lightsalmon: '#FFA07A', lightseagreen: '#20B2AA', lightskyblue: '#87CEFA', lightslategray: '#778899', lightslategrey: '#778899', lightsteelblue: '#B0C4DE', lightyellow: '#FFFFE0', limegreen: '#32CD32', linen: '#FAF0E6', magenta: '#FF00FF', mediumaquamarine: '#66CDAA', mediumblue: '#0000CD', mediumorchid: '#BA55D3', mediumpurple: '#9370DB', mediumseagreen: '#3CB371', mediumslateblue: '#7B68EE', mediumspringgreen: '#00FA9A', mediumturquoise: '#48D1CC', mediumvioletred: '#C71585', midnightblue: '#191970', mintcream: '#F5FFFA', mistyrose: '#FFE4E1', moccasin: '#FFE4B5', navajowhite: '#FFDEAD', oldlace: '#FDF5E6', olivedrab: '#6B8E23', orange: '#FFA500', orangered: '#FF4500', orchid: '#DA70D6', palegoldenrod: '#EEE8AA', palegreen: '#98FB98', paleturquoise: '#AFEEEE', palevioletred: '#DB7093', papayawhip: '#FFEFD5', peachpuff: '#FFDAB9', peru: '#CD853F', pink: '#FFC0CB', plum: '#DDA0DD', powderblue: '#B0E0E6', rosybrown: '#BC8F8F', royalblue: '#4169E1', saddlebrown: '#8B4513', salmon: '#FA8072', sandybrown: '#F4A460', seagreen: '#2E8B57', seashell: '#FFF5EE', sienna: '#A0522D', skyblue: '#87CEEB', slateblue: '#6A5ACD', slategray: '#708090', slategrey: '#708090', snow: '#FFFAFA', springgreen: '#00FF7F', steelblue: '#4682B4', tan: '#D2B48C', thistle: '#D8BFD8', tomato: '#FF6347', turquoise: '#40E0D0', violet: '#EE82EE', wheat: '#F5DEB3', whitesmoke: '#F5F5F5', yellowgreen: '#9ACD32' }; function getRgbHslContent(styleString) { var start = styleString.indexOf('(', 3); var end = styleString.indexOf(')', start + 1); var parts = styleString.substring(start + 1, end).split(','); // add alpha if needed if (parts.length != 4 || styleString.charAt(3) != 'a') { parts[3] = 1; } return parts; } function percent(s) { return parseFloat(s) / 100; } function clamp(v, min, max) { return Math.min(max, Math.max(min, v)); } function hslToRgb(parts){ var r, g, b, h, s, l; h = parseFloat(parts[0]) / 360 % 360; if (h < 0) h++; s = clamp(percent(parts[1]), 0, 1); l = clamp(percent(parts[2]), 0, 1); if (s == 0) { r = g = b = l; // achromatic } else { var q = l < 0.5 ? l * (1 + s) : l + s - l * s; var p = 2 * l - q; r = hueToRgb(p, q, h + 1 / 3); g = hueToRgb(p, q, h); b = hueToRgb(p, q, h - 1 / 3); } return '#' + decToHex[Math.floor(r * 255)] + decToHex[Math.floor(g * 255)] + decToHex[Math.floor(b * 255)]; } function hueToRgb(m1, m2, h) { if (h < 0) h++; if (h > 1) h--; if (6 * h < 1) return m1 + (m2 - m1) * 6 * h; else if (2 * h < 1) return m2; else if (3 * h < 2) return m1 + (m2 - m1) * (2 / 3 - h) * 6; else return m1; } var processStyleCache = {}; function processStyle(styleString) { if (styleString in processStyleCache) { return processStyleCache[styleString]; } var str, alpha = 1; styleString = String(styleString); if (styleString.charAt(0) == '#') { str = styleString; } else if (/^rgb/.test(styleString)) { var parts = getRgbHslContent(styleString); var str = '#', n; for (var i = 0; i < 3; i++) { if (parts[i].indexOf('%') != -1) { n = Math.floor(percent(parts[i]) * 255); } else { n = +parts[i]; } str += decToHex[clamp(n, 0, 255)]; } alpha = +parts[3]; } else if (/^hsl/.test(styleString)) { var parts = getRgbHslContent(styleString); str = hslToRgb(parts); alpha = parts[3]; } else { str = colorData[styleString] || styleString; } return processStyleCache[styleString] = {color: str, alpha: alpha}; } var DEFAULT_STYLE = { style: 'normal', variant: 'normal', weight: 'normal', size: 10, family: 'sans-serif' }; // Internal text style cache var fontStyleCache = {}; function processFontStyle(styleString) { if (fontStyleCache[styleString]) { return fontStyleCache[styleString]; } var el = document.createElement('div'); var style = el.style; try { style.font = styleString; } catch (ex) { // Ignore failures to set to invalid font. } return fontStyleCache[styleString] = { style: style.fontStyle || DEFAULT_STYLE.style, variant: style.fontVariant || DEFAULT_STYLE.variant, weight: style.fontWeight || DEFAULT_STYLE.weight, size: style.fontSize || DEFAULT_STYLE.size, family: style.fontFamily || DEFAULT_STYLE.family }; } function getComputedStyle(style, element) { var computedStyle = {}; for (var p in style) { computedStyle[p] = style[p]; } // Compute the size var canvasFontSize = parseFloat(element.currentStyle.fontSize), fontSize = parseFloat(style.size); if (typeof style.size == 'number') { computedStyle.size = style.size; } else if (style.size.indexOf('px') != -1) { computedStyle.size = fontSize; } else if (style.size.indexOf('em') != -1) { computedStyle.size = canvasFontSize * fontSize; } else if(style.size.indexOf('%') != -1) { computedStyle.size = (canvasFontSize / 100) * fontSize; } else if (style.size.indexOf('pt') != -1) { computedStyle.size = fontSize / .75; } else { computedStyle.size = canvasFontSize; } // Different scaling between normal text and VML text. This was found using // trial and error to get the same size as non VML text. computedStyle.size *= 0.981; return computedStyle; } function buildStyle(style) { return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + style.size + 'px ' + style.family; } var lineCapMap = { 'butt': 'flat', 'round': 'round' }; function processLineCap(lineCap) { return lineCapMap[lineCap] || 'square'; } /** * This class implements CanvasRenderingContext2D interface as described by * the WHATWG. * @param {HTMLElement} canvasElement The element that the 2D context should * be associated with */ function CanvasRenderingContext2D_(canvasElement) { this.m_ = createMatrixIdentity(); this.mStack_ = []; this.aStack_ = []; this.currentPath_ = []; // Canvas context properties this.strokeStyle = '#000'; this.fillStyle = '#000'; this.lineWidth = 1; this.lineJoin = 'miter'; this.lineCap = 'butt'; this.miterLimit = Z * 1; this.globalAlpha = 1; this.font = '10px sans-serif'; this.textAlign = 'left'; this.textBaseline = 'alphabetic'; this.canvas = canvasElement; var cssText = 'width:' + canvasElement.clientWidth + 'px;height:' + canvasElement.clientHeight + 'px;overflow:hidden;position:absolute'; var el = canvasElement.ownerDocument.createElement('div'); el.style.cssText = cssText; canvasElement.appendChild(el); var overlayEl = el.cloneNode(false); // Use a non transparent background. overlayEl.style.backgroundColor = 'red'; overlayEl.style.filter = 'alpha(opacity=0)'; canvasElement.appendChild(overlayEl); this.element_ = el; this.arcScaleX_ = 1; this.arcScaleY_ = 1; this.lineScale_ = 1; } var contextPrototype = CanvasRenderingContext2D_.prototype; contextPrototype.clearRect = function() { if (this.textMeasureEl_) { this.textMeasureEl_.removeNode(true); this.textMeasureEl_ = null; } this.element_.innerHTML = ''; }; contextPrototype.beginPath = function() { // TODO: Branch current matrix so that save/restore has no effect // as per safari docs. this.currentPath_ = []; }; contextPrototype.moveTo = function(aX, aY) { var p = getCoords(this, aX, aY); this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); this.currentX_ = p.x; this.currentY_ = p.y; }; contextPrototype.lineTo = function(aX, aY) { var p = getCoords(this, aX, aY); this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); this.currentX_ = p.x; this.currentY_ = p.y; }; contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, aCP2x, aCP2y, aX, aY) { var p = getCoords(this, aX, aY); var cp1 = getCoords(this, aCP1x, aCP1y); var cp2 = getCoords(this, aCP2x, aCP2y); bezierCurveTo(this, cp1, cp2, p); }; // Helper function that takes the already fixed cordinates. function bezierCurveTo(self, cp1, cp2, p) { self.currentPath_.push({ type: 'bezierCurveTo', cp1x: cp1.x, cp1y: cp1.y, cp2x: cp2.x, cp2y: cp2.y, x: p.x, y: p.y }); self.currentX_ = p.x; self.currentY_ = p.y; } contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { // the following is lifted almost directly from // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes var cp = getCoords(this, aCPx, aCPy); var p = getCoords(this, aX, aY); var cp1 = { x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) }; var cp2 = { x: cp1.x + (p.x - this.currentX_) / 3.0, y: cp1.y + (p.y - this.currentY_) / 3.0 }; bezierCurveTo(this, cp1, cp2, p); }; contextPrototype.arc = function(aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) { aRadius *= Z; var arcType = aClockwise ? 'at' : 'wa'; var xStart = aX + mc(aStartAngle) * aRadius - Z2; var yStart = aY + ms(aStartAngle) * aRadius - Z2; var xEnd = aX + mc(aEndAngle) * aRadius - Z2; var yEnd = aY + ms(aEndAngle) * aRadius - Z2; // IE won't render arches drawn counter clockwise if xStart == xEnd. if (xStart == xEnd && !aClockwise) { xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something // that can be represented in binary } var p = getCoords(this, aX, aY); var pStart = getCoords(this, xStart, yStart); var pEnd = getCoords(this, xEnd, yEnd); this.currentPath_.push({type: arcType, x: p.x, y: p.y, radius: aRadius, xStart: pStart.x, yStart: pStart.y, xEnd: pEnd.x, yEnd: pEnd.y}); }; contextPrototype.rect = function(aX, aY, aWidth, aHeight) { this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); }; contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { var oldPath = this.currentPath_; this.beginPath(); this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); this.stroke(); this.currentPath_ = oldPath; }; contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { var oldPath = this.currentPath_; this.beginPath(); this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); this.fill(); this.currentPath_ = oldPath; }; contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { var gradient = new CanvasGradient_('gradient'); gradient.x0_ = aX0; gradient.y0_ = aY0; gradient.x1_ = aX1; gradient.y1_ = aY1; return gradient; }; contextPrototype.createRadialGradient = function(aX0, aY0, aR0, aX1, aY1, aR1) { var gradient = new CanvasGradient_('gradientradial'); gradient.x0_ = aX0; gradient.y0_ = aY0; gradient.r0_ = aR0; gradient.x1_ = aX1; gradient.y1_ = aY1; gradient.r1_ = aR1; return gradient; }; contextPrototype.drawImage = function(image, var_args) { var dx, dy, dw, dh, sx, sy, sw, sh; // to find the original width we overide the width and height var oldRuntimeWidth = image.runtimeStyle.width; var oldRuntimeHeight = image.runtimeStyle.height; image.runtimeStyle.width = 'auto'; image.runtimeStyle.height = 'auto'; // get the original size var w = image.width; var h = image.height; // and remove overides image.runtimeStyle.width = oldRuntimeWidth; image.runtimeStyle.height = oldRuntimeHeight; if (arguments.length == 3) { dx = arguments[1]; dy = arguments[2]; sx = sy = 0; sw = dw = w; sh = dh = h; } else if (arguments.length == 5) { dx = arguments[1]; dy = arguments[2]; dw = arguments[3]; dh = arguments[4]; sx = sy = 0; sw = w; sh = h; } else if (arguments.length == 9) { sx = arguments[1]; sy = arguments[2]; sw = arguments[3]; sh = arguments[4]; dx = arguments[5]; dy = arguments[6]; dw = arguments[7]; dh = arguments[8]; } else { throw Error('Invalid number of arguments'); } var d = getCoords(this, dx, dy); var w2 = sw / 2; var h2 = sh / 2; var vmlStr =
