JS转换HTML转义符的方法

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function removeHtmlTab(tab) { 
 return tab.replace(/<[^<>]+?>/g,'');//删除所有HTML标签 
}

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function html2Escape(sHtml) { 
 return sHtml.replace(/[<>&"]/g,function(c){return {'<':'<','>':'>','&':'&','"':'"'}[c];}); 
}

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function escape2Html(str) { 
 var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'}; 
 return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){return arrEntities[t];}); 
}

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function nbsp2Space(str) { 
 var arrEntities = {'nbsp' : ' '}; 
 return str.replace(/&(nbsp);/ig, function(all, t){return arrEntities[t]}) 
}

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function return2Br(str) { 
 return str.replace(/r?n/g,"<br />"); 
}

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function trimBr(str) { 
 str=str.replace(/((s| )*r?n){3,}/g,"rnrn");//限制最多2次换行 
 str=str.replace(/^((s| )*r?n)+/g,'');//清除开头换行 
 str=str.replace(/((s| )*r?n)+$/g,'');//清除结尾换行 
 return str; 
}

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function mergeSpace(str) { 
 str=str.replace(/(s| )+/g,' '); 
 return str; 
}