请教一下这些是什么语法
http://www.jiathis.com/getcode/button
这个网址有一个分享按钮的功能,它提供的一段代码.其中的http://v2.jiathis.com/code/jia.js
如下,谁能讲解一下这是javascript语法吗?怎么理解,谢谢.
/* (c) 2010 JiaThis, LLC, 1215*/
eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('4 D={2F:"2G://J.1u.6",2H:"2G://l.1u.6",1a:"",1b:0,2I:"43",1v:"44",1R:"",2J:{\'45\':\'复制网址,46\',\'47\':\'收藏夹,48\',\'49\':\'邮件,4a\',\'4b\':\'谷歌4c,4d\',\'4e\':\'1l空间,4f,4g.2K.1w.6\',\'4h\':\'百度搜藏,4i,4j.1x.6\',\'4k\':\'新浪微博,4l,t.2L.6.Q\',\'4m\':\'搜狐微博,4n,t.1S.6\',\'4o\':\'网易微博,4p,t.4q.6\',\'4r\':\'腾讯微博,4s,t.1w.6\',\'4t\':\'人人网,4u,4v.2M.6\',\'4w\':\'开心网,4x,J.2N.6\',\'4y\':\'搜狐白社会,4z,4A.1S.6\',\'4B\':\'淘江湖,4C,4D.2O.6\',\'4E\':\'百度空间,4F,4G.4H.1x.6\',\'4I\':\'腾讯朋友,4J,4K.1w.6\',\'4L\':\'饭否,4M,4N.6\',\'4O\':\'手机,4P\',\'4Q\':\'优士网,4R,J.4S.Q\',\'4T\':\'4U邮箱,4V,1T.2P.6\',\'4W\':\'4X邮箱,4Y\',\'4Z\':\'52! 1T,2Q! 1T\',\'53\':\'飞信,54,55.56.2R.Q\',\'57\':\'51社区,58,59.51.6\',\'5a\':\'谷歌,5b\',\'5c\':\'有道书签,5d,2S.5e.6\',\'5f\':\'1l收藏,5g,2S.1w.6\',\'5h\':\'1y,2T\',\'5i\':\'新浪2U,5j,2U.2L.6.Q\',\'5k\':\'微软2V,5l,5m-5n.5o.2V.6\',\'5p\':\'雅虎收藏,5q,5r.Q.2Q.6\',\'5s\':\'5t收藏,5u\',\'5v\':\'和讯,5w,5x.5y.6\',\'5z\':\'天极,5A\',\'5B\':\'2W说客,5C,5D.2R.Q\',\'5E\':\'百度贴吧,5F,5G.1x.6\',\'5H\':\'好诶,5I,J.5J.6\',\'5K\':\'嘀咕网,5L,5M.6\',\'5N\':\'豆瓣,K,J.1U.6\',\'5O\':\'抓虾,5P\',\'5Q\':\'鲜果,5R\',\'5S\':\'做啥,5T,5U.6\',\'5V\':\'人间网,5W,5X.6\',\'5Y\':\'5Z,2X,J.2X.6\',\'60\':\'1V,1V,J.1V.6\',\'61\':\'1W,1W,1W.6\',\'62\':\'2Y,2Y\',\'63\':\'2Z,2Z\',\'64\':\'30,30\',\'65\':\'66网,67,68.69.Q\',\'6a\':\'若邻网,6b\',\'6c\':\'中金微博,6d\',\'6e\':\'乐收,6f,6g.6h.6\',\'6i\':\'奇客发现,6j,J.6k.6\',\'6l\':\'同学网,6m\',\'6n\':\'挖客网,6o\',\'6p\':\'收客网,6q\',\'6r\':\'创业邦,6s,u.6t.Q\',\'6u\':\'就喜欢,6v,J.6w.6\',\'6x\':\'6y啦,6z\',\'6A\':\'救救地球,6B\',\'6C\':\'抽屉网,6D\',\'6E\':\'递客网,6F,J.6G.Q\',\'6H\':\'豆瓣9点,6I,9.1U.6\',\'6J\':\'黑米书签,6K,J.6L.6\',\'6M\':\'宝盒网,6N,J.6O.6\',\'6P\':\'易集网,6Q,J.6R.6\',\'6S\':\'6T在线转换,6U\',\'6V\':\'友好打印,6W\',\'6X\':\'英文翻译,6Y\',\'6Z\':\'谷歌阅读器,70\',\'71\':\'72.6,73.6\',\'74\':\'75,76\',\'77\':\'78,79\',\'7a\':\'7b,7c\',\'7d\':\'7e,7f\',\'7g\':\'7h,7i\',\'7j\':\'7k.6,7l.6\',\'7m\':\'7n,7o\',\'7p\':\'31.32,31.32\',\'7q\':\'7r.6,7s.6\',\'7t\':\'7u,7v\',\'7w\':\'7x,7y\',\'7z\':\'7A-7B,7C-7D\',\'7E\':\'7F,7G\',\'7H\':\'7I.6,7J.6\',\'7K\':\'7L.6,7M.6\',\'7N\':\'7O.6,7P.6\',\'7Q\':\'33,33\',\'7R\':\'34,34\'}};(x(){4 n=1g.1z(\'1c\');N(4 i=0,y;y=n[i++];){7(/1u.6/.1d(y.R)){D.1a=y.R.7S(0,y.R.7T("/"));y.R.1X(/(1b)=([^&]+)/g,x(a,p,v){D[p]=v})}}4 d=1g,1Y=d.7U=="7V",1e=d.7W,K=d.7X,m=1Z.35,36=!!d.37,20=38.39.3a(),1A=d.1z("1A")[0],14=D.2I,L=D.2J,3b=d.7Y,3c=x(){M{h:(1Y?1e:K).7Z,w:(1Y?1e:K).80}},1B=x(){M{t:m(1e.21,K.21),l:m(1e.22,K.22)}},3d=x(a){4 r={t:0,l:0},3e=/81/.1d(20),1h=x(t,l){r.l+=l,r.t+=t},p=a,23=1B();7(a&&a!=K){7(a.3f){4 b=a.3f();7(b.S==b.82){4 g=a.A.B;a.A.B="1f";b.S=b.S-a.15;a.A.B=g}1h(b.S+23.t-1e.83,b.1i+23.l-1e.84)}G{4 c=d.85;24(p){1h(p.3g,p.3h);4 e=c.86(p,3i);7(3e){4 f=1C(e.25("3j-1i-1D"),10)||0,26=1C(e.25("3j-S-1D"),10)||0;1h(26,f);7(p!=a&&e.25("27")!="87"){1h(26,f)}}p=p.88}p=a.28;24(p&&p!=K){1h(-p.21,-p.22);p=p.28}}}M r},17=x(o,t,a){4 b=d.89(t||"F");N(4 p 1E o){p=="A"?(b[p].8a=o[p]):(b[p]=o[p])}M(a||K).8b(b,(a||K).8c)},3k=x(a,b){4 c={};N(4 i=0;i<a.1m;i++){c[a[i]]=1}N(4 i=0;i<b.1m;i++){7(!c[b[i]]){a.8d(b[i]);c[b[i]]=1}}M a},29=x(){4 b="2K,8e,2M,2N,8f,8g,2O,8h,2T,2W,8i,2P,1S,1U,1x,8j";4 c=D.1R||b;4 e=3k(c.O(","),b.O(","));4 f={};4 h=d.1z("a");N(4 i=0,y,V;y=h[i++];){7(/\\8k\\b/.1d(y.1n)){7(!/\\8l\\b/.1d(y.W)){y.W=\'<1j 2a="3l">\'+y.W+\'</1j>\'}y.3m=$18.2b;y.8m=$18.3n;y.2c=$18.3o;y.3p=$18.3q;y.8n=1o;8o}7(y.1n&&(V=y.1n.1F(/^8p(\\w+)$/))&&V[1]){4 g=\'\';4 t=1k;7(V[1].19("3r")>-1||V[1].19("8q")>-1){7(V[1].19("3r")>-1){t=1o;4 s=y.1n.1F(/8r([0-9]+)(?:\\s|$)/)}G{4 s=y.1n.1F(/8s([0-9]+)(?:\\s|$)/)}4 j=((s&&s.1m)?1Z.8t(16,1Z.35(1,1C(s[1]))):1)-1;8u{g=e[j++]}24(j<e.1m&&(!L[14+g]||f[g]));7(f[g]||!L[14+g]){g=\'\';N(4 k 1E L){k=k.2d(3);7(!f[k]&&L[14+k]){g=k;3s}}}}G{7(L[14+V[1]]&&!f[V[1]]){g=V[1]}}7(g&&L[14+g]){f[g]=1;4 l=L[14+g].O(\',\');4 m=y.W.1X(/^\\s+|\\s+$/g,"");7(t||m){m=m?m:l[0];y.W=\'<1j 3t="3u 8v 3v 3w\'+g+\'">\'+m+\'</1j>\'}G{y.W=\'<1j 3t="3u 3v 3w\'+g+\'"></1j>\'}y.2c=x(a){M x(){3x(a)}}(g);y.1p="8w:;";7(!y.X){y.X=(g!="3y"?"分享到":"")+l[0]}}G{y.W=""}}}},8x=x(a){4 b=E.1q;7(8y(E.1q)!=\'x\'){E.1q=a}G{E.1q=x(){7(b){b()}a()}}},2e=x(e){7(!!e.3z&&e.3z.2d(-12)==".1u.6"){7(e.2f&&e.2f!="8z"){D.1R=e.2f}}29();3A()},3A=x(){4 o,H,Y,1G,2g,q,s;o=3B(3b);Y=E.1r.1p||"";1G=Y?Y.19(D.1v):-1;7(1G>-1){2g=Y.3C(1G);q=2g.O("&").3D().O("#").3D().O("=").3E();q=L[14+q]?q:\'\'}q=(!q&&o.1H)?o.1H:q;7(q){s=\'8A=\'+q+\'&8B=\'+1C(D.1b)+\'&8C=\'+1I(o.2h)+\'&8D=\'+1I(o.3F)+\'&8E=\'+1I(Y);(8F 8G).R=D.2H+"/l.8H?"+s}},3B=x(r){4 h="",p="",q="",m;7(r.1F(/(?:[a-z]\\:\\/\\/)([^\\/\\?]+)(.*)/8I)){h=3G.$1;p=3G.$2;h=h?h:"";p=p?p:"";7(h){N(4 k 1E L){m=L[k].O(\',\');7(m[2]&&m[2]==h){q=k.2d(3);3s}}}}M{2h:h,3F:p,1H:q}},8J=!!E.3H?17({A:"B:Z;",3I:0,R:D.1a+"/8K.8L"},"11"):3i,F=17({2a:"2i",A:"1J:2j;z-3J:3K;B:Z;27:3L;"}),I=17({2a:"2i",A:"1J:2j;z-3J:3K;B:Z;S:50%;1i:50%;27:3L;"}),11=17({A:"1J:"+(/8M/.1d(20)?"8N":"2j")+";B:Z;8O:8P(3M=0);3M:0",3I:0},"11"),1K,2k,1s,2l,h,1t={},13;17({1p:D.1a+"/2m/8Q.2m",8R:"8S",8T:"8U/2m"},"8V");$18={3E:F,8W:I,2n:x(b){4 c=E.8X||b,t=c.8Y||c.8Z,3N=I.1L?I.1L(t):!!(I.3O(t)&16),a=d.3P("3l"),3Q=F.1L?F.1L(t):!!(F.3O(t)&16);7(!3N&&!3Q&&t!=a){11.A.B=I.A.B="Z"}},3q:x(){4 s,T=1M,2o,1N=x(){2o=90(x(){7(F.W){4 p=3d(T),3R=3c(),3S=1B();2p(F.A){B="1f";4 a=T.A.B;T.A.B="1f";S=(p.t+T.15+F.15>3R.h+3S.t?p.t-F.15:p.t+T.15)+"P";1i=p.l+"P";T.A.B=a}2p(11.A){S=F.3g+"P";1i=F.3h+"P";1D=F.2q+"P";3T=F.15+"P";1O="";B="1f"}91(2o)}},50)};7(!13){13=17({R:D.1a+"/2i.2r",2s:"2t-8"},"1c",1A);13.2u=0;13.1q=x(){13.2u=1;1N()};13.92=x(){/93|94/.1d(13.95)&&!13.2u&&1N()}}G{1N()}M 1k},2b:x(){1K=3U(x(){F.A.B="Z";I.A.B!="1f"&&(11.A.B="Z")},3V)},3n:x(){2v(1K)},3o:x(){F.A.B=11.A.B="Z";7(!1M.1c){1M.1c=17({R:D.1a+"/96.2r",2s:"2t-8"},"1c",1A);K.A.1J="97"}G{4 a=1B();I.A.B="1f";I.A.1O=(-I.15/2+a.t)+"P "+(-I.2q/2+a.l)+"P";1s=d.3P("98"),2l=1s.2w(1o),h=2l.1z("99");N(4 i=0,y;y=h[i++];){1t[y.3W]=y.28}2p(11.A){1i=S="50%";1D=I.2q+"P";3T=I.15+"P";1O=I.A.1O;B="1f"}}M 1k},9a:x(o){2v(2k);2k=3U(x(){4 s=o.3W.1X(/^\\s+|\\s+$/,""),2x=d.9b();N(4 p 1E 1t){9c("4 f = /"+(s||".")+"/9d.1d(p)");!!1t[p].2w&&(f&&2x.3X(1t[p].2w(1o)))}1s.W="";1s.3X(2x)},3V)},9e:x(){11.A.B=I.A.B="Z"}};7(!!E.1P){!!E.1P&&E.1P("9f",2e,1k)}G{7(!!E.3H){(!!E.2y&&E.2y("9g",2e))}G{29()}}F.3p=x(){2v(1K)};F.3m=x(){$18.2b()};36?d.2y("2c",$18.2n):d.1P("9h",$18.2n,1k);E.1r.2h&&d.9i(\'<1c R="\'+D.1a+\'/m.2r" 2s="2t-8"></1c>\')})();x 3x(a){4 e=1I,H;2z{H=2A}2B(2C){H={}};7(a==\'3y\'){3Y()}G 7(a==\'9j\'){3Z()}G{4 U=9k(H.1Q||1r);7(H.9l&&D.1b){4 b=U.O("?");U=b[0]||"";7(b[1]){4 s="?";4 c=(b[1]||"").O("&");N(4 i=0;i<c.1m;i++){4 d=c[i].O("=");7(d[0]&&d[0]!=D.1v){U+=s+d[0]+"="+(d[1]||"");s="&"}}}U+=((U.19("?")>-1)?"&":"?")+D.1v+"="+a}E.9m(D.2F+\'/9n/?1H=\'+a+\'&1Q=\'+e(U)+\'&X=\'+e(H.X||1g.X)+(D.1b?\'&1b=\'+D.1b:\'\'),\'\')}M 1k}x 3Y(){2z{H=2A}2B(2C){H={}};4