JavaScript实现飘雪积雪特效

(function(e,t,n){"use strict";function r(e,t,n){var r=e.runtimeStyle&&e.runtimeStyle[t],i,s=e.style;return!/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test(n)&&/^-?\d/.test(n)&&(i=s.left,r&&(e.runtimeStyle.left=e.currentStyle.left),s.left=t==="fontSize"?"1em":n||0,n=s.pixelLeft+"px",s.left=i,r&&(e.runtimeStyle.left=r)),/^(thin|medium|thick)$/i.test(n)?n:Math.round(parseFloat(n))+"px"}function i(e){return parseInt(e,10)}function s(e,t,i,s){e=(e||"").split(","),e=e[s||0]||e[0]||"auto",e=f.Util.trimText(e).split(" ");if(i!=="backgroundSize"||!!e[0]&&!e[0].match(/cover|contain|auto/)){e[0]=e[0].indexOf("%")===-1?r(t,i+"X",e[0]):e[0];if(e[1]===n){if(i==="backgroundSize")return e[1]="auto",e;e[1]=e[0]}e[1]=e[1].indexOf("%")===-1?r(t,i+"Y",e[1]):e[1]}return e}function o(e,t,n,r,i,s){var o=f.Util.getCSS(t,e,i),u,a,l,c;o.length===1&&(c=o[0],o=[],o[0]=c,o[1]=c);if(o[0].toString().indexOf("%")!==-1)l=parseFloat(o[0])/100,a=n.width*l,e!=="backgroundSize"&&(a-=(s||r).width*l);else if(e==="backgroundSize")if(o[0]==="auto")a=r.width;else if(/contain|cover/.test(o[0])){var h=f.Util.resizeBounds(r.width,r.height,n.width,n.height,o[0]);a=h.width,u=h.height}else a=parseInt(o[0],10);else a=parseInt(o[0],10);return o[1]==="auto"?u=a/r.width*r.height:o[1].toString().indexOf("%")!==-1?(l=parseFloat(o[1])/100,u=n.height*l,e!=="backgroundSize"&&(u-=(s||r).height*l)):u=parseInt(o[1],10),[a,u]}function u(e,t){var n=[];return{storage:n,width:e,height:t,clip:function(){n.push({type:"function",name:"clip",arguments:arguments})},translate:function(){n.push({type:"function",name:"translate",arguments:arguments})},fill:function(){n.push({type:"function",name:"fill",arguments:arguments})},save:function(){n.push({type:"function",name:"save",arguments:arguments})},restore:function(){n.push({type:"function",name:"restore",arguments:arguments})},fillRect:function(){n.push({type:"function",name:"fillRect",arguments:arguments})},createPattern:function(){n.push({type:"function",name:"createPattern",arguments:arguments})},drawShape:function(){var e=[];return n.push({type:"function",name:"drawShape",arguments:e}),{moveTo:function(){e.push({name:"moveTo",arguments:arguments})},lineTo:function(){e.push({name:"lineTo",arguments:arguments})},arcTo:function(){e.push({name:"arcTo",arguments:arguments})},bezierCurveTo:function(){e.push({name:"bezierCurveTo",arguments:arguments})},quadraticCurveTo:function(){e.push({name:"quadraticCurveTo",arguments:arguments})}}},drawImage:function(){n.push({type:"function",name:"drawImage",arguments:arguments})},fillText:function(){n.push({type:"function",name:"fillText",arguments:arguments})},setVariable:function(e,t){return n.push({type:"variable",name:e,arguments:t}),t}}}function a(e){return{zindex:e,children:[]}}var f={},l,c,h;f.Util={},f.Util.log=function(t){f.logging&&e.console&&e.console.log&&e.console.log(t)},f.Util.trimText=function(e){return function(t){return e?e.apply(t):((t||"")+"").replace(/^\s+|\s+$/g,"")}}(String.prototype.trim),f.Util.asFloat=function(e){return parseFloat(e)},function(){var e=/((rgba|rgb)\([^\)]+\)(\s-?\d+px){0,})/g,t=/(-?\d+px)|(#.+)|(rgb\(.+\))|(rgba\(.+\))/g;f.Util.parseTextShadows=function(n){if(!n||n==="none")return[];var r=n.match(e),i=[];for(var s=0;r&&s<r.length;s++){var o=r[s].match(t);i.push({color:o[0],offsetX:o[1]?o[1].replace("px",""):0,offsetY:o[2]?o[2].replace("px",""):0,blur:o[3]?o[3].replace("px",""):0})}return i}}(),f.Util.parseBackgroundImage=function(e){var t=" \r\n    ",n,r,i,s,o,u=[],a,f=0,l=0,c,h,p=function(){n&&(r.substr(0,1)===‘"‘&&(r=r.substr(1,r.length-2)),r&&h.push(r),n.substr(0,1)==="-"&&(s=n.indexOf("-",1)+1)>0&&(i=n.substr(0,s),n=n.substr(s)),u.push({prefix:i,method:n.toLowerCase(),value:o,args:h})),h=[],n=i=r=o=""};p();for(var d=0,v=e.length;d<v;d++){a=e[d];if(f===0&&t.indexOf(a)>-1)continue;switch(a){case‘"‘:c?c===a&&(c=null):c=a;break;case"(":if(c)break;if(f===0){f=1,o+=a;continue}l++;break;case")":if(c)break;if(f===1){if(l===0){f=0,o+=a,p();continue}l--}break;case",":if(c)break;if(f===0){p();continue}if(f===1&&l===0&&!n.match(/^url$/i)){h.push(r),r="",o+=a;continue}}o+=a,f===0?n+=a:r+=a}return p(),u},f.Util.Bounds=function(e){var t,n={};return e.getBoundingClientRect&&(t=e.getBoundingClientRect(),n.top=t.top,n.bottom=t.bottom||t.top+t.height,n.left=t.left,n.width=e.offsetWidth,n.height=e.offsetHeight),n},f.Util.OffsetBounds=function(e){var t=e.offsetParent?f.Util.OffsetBounds(e.offsetParent):{top:0,left:0};return{top:e.offsetTop+t.top,bottom:e.offsetTop+e.offsetHeight+t.top,left:e.offsetLeft+t.left,width:e.offsetWidth,height:e.offsetHeight}},f.Util.getCSS=function(e,n,r){l!==e&&(c=t.defaultView.getComputedStyle(e,null));var o=c[n];if(/^background(Size|Position)$/.test(n))return s(o,e,n,r);if(/border(Top|Bottom)(Left|Right)Radius/.test(n)){var u=o.split(" ");return u.length<=1&&(u[1]=u[0]),u.map(i)}return o},f.Util.resizeBounds=function(e,t,n,r,i){var s=n/r,o=e/t,u,a;return!i||i==="auto"?(u=n,a=r):s<o^i==="contain"?(a=r,u=r*o):(u=n,a=n/o),{width:u,height:a}},f.Util.BackgroundPosition=function(e,t,n,r,i){var s=o("backgroundPosition",e,t,n,r,i);return{left:s[0],top:s[1]}},f.Util.BackgroundSize=function(e,t,n,r){var i=o("backgroundSize",e,t,n,r);return{width:i[0],height:i[1]}},f.Util.Extend=function(e,t){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n]);return t},f.Util.Children=function(e){var t;try{t=e.nodeName&&e.nodeName.toUpperCase()==="IFRAME"?e.contentDocument||e.contentWindow.document:function(e){var t=[];return e!==null&&function(e,t){var r=e.length,i=0;if(typeof t.length=="number")for(var s=t.length;i<s;i++)e[r++]=t[i];else while(t[i]!==n)e[r++]=t[i++];return e.length=r,e}(t,e),t}(e.childNodes)}catch(r){f.Util.log("html2canvas.Util.Children failed with exception: "+r.message),t=[]}return t},f.Util.isTransparent=function(e){return e==="transparent"||e==="rgba(0, 0, 0, 0)"},f.Util.Font=function(){var e={};return function(t,r,i){if(e[t+"-"+r]!==n)return e[t+"-"+r];var s=i.createElement("div"),o=i.createElement("img"),u=i.createElement("span"),a="Hidden Text",f,l,c;return s.style.visibility="hidden",s.style.fontFamily=t,s.style.fontSize=r,s.style.margin=0,s.style.padding=0,i.body.appendChild(s),o.src="data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=",o.width=1,o.height=1,o.style.margin=0,o.style.padding=0,o.style.verticalAlign="baseline",u.style.fontFamily=t,u.style.fontSize=r,u.style.margin=0,u.style.padding=0,u.appendChild(i.createTextNode(a)),s.appendChild(u),s.appendChild(o),f=o.offsetTop-u.offsetTop+1,s.removeChild(u),s.appendChild(i.createTextNode(a)),s.style.lineHeight="normal",o.style.verticalAlign="super",l=o.offsetTop-s.offsetTop+1,c={baseline:f,lineWidth:1,middle:l},e[t+"-"+r]=c,i.body.removeChild(s),c}}(),function(){function e(e){return function(t){try{e.addColorStop(t.stop,t.color)}catch(r){n.log(["failed to add color stop: ",r,"; tried to add: ",t])}}}var n=f.Util,r={};f.Generate=r;var i=[/^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)\-]+)\)$/,/^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,/^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\(\)]+)\)$/,/^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/];r.parseGradient=function(e,t){var n,r,s=i.length,o,u,a,f,l,c,h,p,d,v;for(r=0;r<s;r+=1){o=e.match(i[r]);if(o)break}if(o)switch(o[1]){case"-webkit-linear-gradient":case"-o-linear-gradient":n={type:"linear",x0:null,y0:null,x1:null,y1:null,colorStops:[]},a=o[2].match(/\w+/g);if(a){f=a.length;for(r=0;r<f;r+=1)switch(a[r]){case"top":n.y0=0,n.y1=t.height;break;case"right":n.x0=t.width,n.x1=0;break;case"bottom":n.y0=t.height,n.y1=0;break;case"left":n.x0=0,n.x1=t.width}}n.x0===null&&n.x1===null&&(n.x0=n.x1=t.width/2),n.y0===null&&n.y1===null&&(n.y0=n.y1=t.height/2),a=o[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);if(a){f=a.length,l=1/Math.max(f-1,1);for(r=0;r<f;r+=1)c=a[r].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/),c[2]?(u=parseFloat(c[2]),c[3]==="%"?u/=100:u/=t.width):u=r*l,n.colorStops.push({color:c[1],stop:u})}break;case"-webkit-gradient":n={type:o[2]==="radial"?"circle":o[2],x0:0,y0:0,x1:0,y1:0,colorStops:[]},a=o[3].match(/(\d{1,3})%?\s(\d{1,3})%?,\s(\d{1,3})%?\s(\d{1,3})%?/),a&&(n.x0=a[1]*t.width/100,n.y0=a[2]*t.height/100,n.x1=a[3]*t.width/100,n.y1=a[4]*t.height/100),a=o[4].match(/((?:from|to|color-stop)\((?:[0-9\.]+,\s)?(?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)\))+/g);if(a){f=a.length;for(r=0;r<f;r+=1)c=a[r].match(/(from|to|color-stop)\(([0-9\.]+)?(?:,\s)?((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\)/),u=parseFloat(c[2]),c[1]==="from"&&(u=0),c[1]==="to"&&(u=1),n.colorStops.push({color:c[3],stop:u})}break;case"-moz-linear-gradient":n={type:"linear",x0:0,y0:0,x1:0,y1:0,colorStops:[]},a=o[2].match(/(\d{1,3})%?\s(\d{1,3})%?/),a&&(n.x0=a[1]*t.width/100,n.y0=a[2]*t.height/100,n.x1=t.width-n.x0,n.y1=t.height-n.y0),a=o[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}%)?)+/g);if(a){f=a.length,l=1/Math.max(f-1,1);for(r=0;r<f;r+=1)c=a[r].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%)?/),c[2]?(u=parseFloat(c[2]),c[3]&&(u/=100)):u=r*l,n.colorStops.push({color:c[1],stop:u})}break;case"-webkit-radial-gradient":case"-moz-radial-gradient":case"-o-radial-gradient":n={type:"circle",x0:0,y0:0,x1:t.width,y1:t.height,cx:0,cy:0,rx:0,ry:0,colorStops:[]},a=o[2].match(/(\d{1,3})%?\s(\d{1,3})%?/),a&&(n.cx=a[1]*t.width/100,n.cy=a[2]*t.height/100),a=o[3].match(/\w+/),c=o[4].match(/[a-z\-]*/);if(a&&c)switch(c[0]){case"farthest-corner":case"cover":case"":h=Math.sqrt(Math.pow(n.cx,2)+Math.pow(n.cy,2)),p=Math.sqrt(Math.pow(n.cx,2)+Math.pow(n.y1-n.cy,2)),d=Math.sqrt(Math.pow(n.x1-n.cx,2)+Math.pow(n.y1-n.cy,2)),v=Math.sqrt(Math.pow(n.x1-n.cx,2)+Math.pow(n.cy,2)),n.rx=n.ry=Math.max(h,p,d,v);break;case"closest-corner":h=Math.sqrt(Math.pow(n.cx,2)+Math.pow(n.cy,2)),p=Math.sqrt(Math.pow(n.cx,2)+Math.pow(n.y1-n.cy,2)),d=Math.sqrt(Math.pow(n.x1-n.cx,2)+Math.pow(n.y1-n.cy,2)),v=Math.sqrt(Math.pow(n.x1-n.cx,2)+Math.pow(n.cy,2)),n.rx=n.ry=Math.min(h,p,d,v);break;case"farthest-side":a[0]==="circle"?n.rx=n.ry=Math.max(n.cx,n.cy,n.x1-n.cx,n.y1-n.cy):(n.type=a[0],n.rx=Math.max(n.cx,n.x1-n.cx),n.ry=Math.max(n.cy,n.y1-n.cy));break;case"closest-side":case"contain":a[0]==="circle"?n.rx=n.ry=Math.min(n.cx,n.cy,n.x1-n.cx,n.y1-n.cy):(n.type=a[0],n.rx=Math.min(n.cx,n.x1-n.cx),n.ry=Math.min(n.cy,n.y1-n.cy))}a=o[5].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);if(a){f=a.length,l=1/Math.max(f-1,1);for(r=0;r<f;r+=1)c=a[r].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/),c[2]?(u=parseFloat(c[2]),c[3]==="%"?u/=100:u/=t.width):u=r*l,n.colorStops.push({color:c[1],stop:u})}}return n},r.Gradient=function(n,r){if(r.width===0||r.height===0)return;var i=t.createElement("canvas"),s=i.getContext("2d"),o,u;i.width=r.width,i.height=r.height,o=f.Generate.parseGradient(n,r);if(o)switch(o.type){case"linear":u=s.createLinearGradient(o.x0,o.y0,o.x1,o.y1),o.colorStops.forEach(e(u)),s.fillStyle=u,s.fillRect(0,0,r.width,r.height);break;case"circle":u=s.createRadialGradient(o.cx,o.cy,0,o.cx,o.cy,o.rx),o.colorStops.forEach(e(u)),s.fillStyle=u,s.fillRect(0,0,r.width,r.height);break;case"ellipse":var a=t.createElement("canvas"),l=a.getContext("2d"),c=Math.max(o.rx,o.ry),h=c*2;a.width=a.height=h,u=l.createRadialGradient(o.rx,o.ry,0,o.rx,o.ry,c),o.colorStops.forEach(e(u)),l.fillStyle=u,l.fillRect(0,0,h,h),s.fillStyle=o.colorStops[o.colorStops.length-1].color,s.fillRect(0,0,i.width,i.height),s.drawImage(a,o.cx-o.rx,o.cy-o.ry,2*o.rx,2*o.ry)}return i},r.ListAlpha=function(e){var t="",n;do n=e%26,t=String.fromCharCode(n+64)+t,e/=26;while(e*26>26);return t},r.ListRoman=function(e){var t=["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"],n=[1e3,900,500,400,100,90,50,40,10,9,5,4,1],r="",i,s=t.length;if(e<=0||e>=4e3)return e;for(i=0;i<s;i+=1)while(e>=n[i])e-=n[i],r+=t[i];return r}}(),f.Parse=function(r,i){function s(){return Math.max(Math.max(lt.body.scrollWidth,lt.documentElement.scrollWidth),Math.max(lt.body.offsetWidth,lt.documentElement.offsetWidth),Math.max(lt.body.clientWidth,lt.documentElement.clientWidth))}function o(){return Math.max(Math.max(lt.body.scrollHeight,lt.documentElement.scrollHeight),Math.max(lt.body.offsetHeight,lt.documentElement.offsetHeight),Math.max(lt.body.clientHeight,lt.documentElement.clientHeight))}function l(e,t){var n=parseInt(vt(e,t),10);return isNaN(n)?0:n}function c(e,t,n,r,i,s){s!=="transparent"&&(e.setVariable("fillStyle",s),e.fillRect(t,n,r,i),ft+=1)}function h(e,t,n){if(e.length>0)return t+n.toUpperCase()}function p(e,t){switch(t){case"lowercase":return e.toLowerCase();case"capitalize":return e.replace(/(^|\s|:|-|\(|\))([a-z])/g,h);case"uppercase":return e.toUpperCase();default:return e}}function d(e){return/^(normal|none|0px)$/.test(e)}function v(e,t,n,r){e!==null&&ct.trimText(e).length>0&&(r.fillText(e,t,n),ft+=1)}function m(e,t,n,r){var i=!1,s=vt(t,"fontWeight"),o=vt(t,"fontFamily"),u=vt(t,"fontSize"),a=ct.parseTextShadows(vt(t,"textShadow"));switch(parseInt(s,10)){case 401:s="bold";break;case 400:s="normal"}e.setVariable("fillStyle",r),e.setVariable("font",[vt(t,"fontStyle"),vt(t,"fontVariant"),s,u,o].join(" ")),e.setVariable("textAlign",i?"right":"left"),a.length&&(e.setVariable("shadowColor",a[0].color),e.setVariable("shadowOffsetX",a[0].offsetX),e.setVariable("shadowOffsetY",a[0].offsetY),e.setVariable("shadowBlur",a[0].blur));if(n!=="none")return ct.Font(o,u,lt)}function g(e,t,n,r,i){switch(t){case"underline":c(e,n.left,Math.round(n.top+r.baseline+r.lineWidth),n.width,1,i);break;case"overline":c(e,n.left,Math.round(n.top),n.width,1,i);break;case"line-through":c(e,n.left,Math.ceil(n.top+r.middle+r.lineWidth),n.width,1,i)}}function y(e,t,n,r,i){var s;if(ht.rangeBounds&&!i){if(n!=="none"||ct.trimText(t).length!==0)s=b(t,e.node,e.textOffset);e.textOffset+=t.length}else if(e.node&&typeof e.node.nodeValue=="string"){var o=r?e.node.splitText(t.length):null;s=w(e.node,i),e.node=o}return s}function b(e,t,n){var r=lt.createRange();return r.setStart(t,n),r.setEnd(t,n+e.length),r.getBoundingClientRect()}function w(e,t){var n=e.parentNode,r=lt.createElement("wrapper"),i=e.cloneNode(!0);r.appendChild(e.cloneNode(!0)),n.replaceChild(r,e);var s=t?ct.OffsetBounds(r):ct.Bounds(r);return n.replaceChild(i,r),s}function E(e,t,n){var 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