tinymce 默认输出的是 引用实体，如： nbsp之类的，而不是直接输出对应的字符。 通过配置 entities 可以达到 直接输出 对应字符的 目的。
配置如下：
entities : 'nbsp,160,iexcl,161,cent,162,pound,163,curren,164,yen,165,brvbar,166,sect,167,uml,168,copy,169,ordf,170,' + 'laquo,171,not,172,shy,173,reg,174,macr,175,deg,176,plusmn,177,sup2,178,sup3,179,acute,180,micro,181,para,182,' + 'middot,183,cedil,184,sup1,185,ordm,186,raquo,187,frac14,188,frac12,189,frac34,190,iquest,191,Agrave,192,Aacute,193,' + 'Acirc,194,Atilde,195,Auml,196,Aring,197,AElig,198,Ccedil,199,Egrave,200,Eacute,201,Ecirc,202,Euml,203,Igrave,204,' + 'Iacute,205,Icirc,206,Iuml,207,ETH,208,Ntilde,209,Ograve,210,Oacute,211,Ocirc,212,Otilde,213,Ouml,214,times,215,' + 'Oslash,216,Ugrave,217,Uacute,218,Ucirc,219,Uuml,220,Yacute,221,THORN,222,szlig,223,agrave,224,aacute,225,acirc,226,' + 'atilde,227,auml,228,aring,229,aelig,230,ccedil,231,egrave,232,eacute,233,ecirc,234,euml,235,igrave,236,iacute,237,' + 'icirc,238,iuml,239,eth,240,ntilde,241,ograve,242,oacute,243,ocirc,244,otilde,245,ouml,246,divide,247,oslash,248,' + 'ugrave,249,uacute,250,ucirc,251,uuml,252,yacute,253,thorn,254,yuml,255,fnof,402,Alpha,913,Beta,914,Gamma,915,Delta,916,' + 'Epsilon,917,Zeta,918,Eta,919,Theta,920,Iota,921,Kappa,922,Lambda,923,Mu,924,Nu,925,Xi,926,Omicron,927,Pi,928,Rho,929,' + 'Sigma,931,Tau,932,Upsilon,933,Phi,934,Chi,935,Psi,936,Omega,937,alpha,945,beta,946,gamma,947,delta,948,epsilon,949,' + 'zeta,950,eta,951,theta,952,iota,953,kappa,954,lambda,955,mu,956,nu,957,xi,958,omicron,959,pi,960,rho,961,sigmaf,962,' + 'sigma,963,tau,964,upsilon,965,phi,966,chi,967,psi,968,omega,969,thetasym,977,upsih,978,piv,982,bull,8226,hellip,8230,' + 'prime,8242,Prime,8243,oline,8254,frasl,8260,weierp,8472,image,8465,real,8476,trade,8482,alefsym,8501,larr,8592,uarr,8593,' + 'rarr,8594,darr,8595,harr,8596,crarr,8629,lArr,8656,uArr,8657,rArr,8658,dArr,8659,hArr,8660,forall,8704,part,8706,exist,8707,' + 'empty,8709,nabla,8711,isin,8712,notin,8713,ni,8715,prod,8719,sum,8721,minus,8722,lowast,8727,radic,8730,prop,8733,infin,8734,' + 'ang,8736,and,8743,or,8744,cap,8745,cup,8746,int,8747,there4,8756,sim,8764,cong,8773,asymp,8776,ne,8800,equiv,8801,le,8804,ge,8805,' + 'sub,8834,sup,8835,nsub,8836,sube,8838,supe,8839,oplus,8853,otimes,8855,perp,8869,sdot,8901,lceil,8968,rceil,8969,lfloor,8970,' + 'rfloor,8971,lang,9001,rang,9002,loz,9674,spades,9824,clubs,9827,hearts,9829,diams,9830,OElig,338,oelig,339,Scaron,352,scaron,353,' + 'Yuml,376,circ,710,tilde,732,ensp,8194,emsp,8195,thinsp,8201,zwnj,8204,zwj,8205,lrm,8206,rlm,8207,ndash,8211,mdash,8212,lsquo,8216,' + 'rsquo,8217,sbquo,8218,ldquo,8220,rdquo,8221,bdquo,8222,dagger,8224,Dagger,8225,permil,8240,lsaquo,8249,rsaquo,8250,euro,8364,'
参考资料：http://www.tinymce.com/wiki.php/Configuration:entities tinymce 官方资料，有些误导性，呵呵