Fixing &ndsp; problem in opf file.

src/epub.js

@@ -7,6 +7,10 @@ var xmlSerializer = new XMLSerializer();
 // var DOMParser = require('xmldom').DOMParser
 var domParser = new DOMParser();
 var generatedBufferType = 'blob'
+var opf_file_base = 'epub_cA3Wt6s6'
+var opf_file_name = opf_file_base+'.opf'
+var ncx_file_name = opf_file_base+'.ncx'
+var nav_file_name = opf_file_base+'.xhtml'
 
 /**
  * I hope JS is single threaded and not preemptive.
@@ -14,7 +18,9 @@ var generatedBufferType = 'blob'
  * @param {*} text
  */
 var escape = function (text){
-    return $('<div>').text(text).html()
+    let html = $('<div>').text(text).html()
+    html = html.replace(/&nbsp;/gi, " ")
+    return html
 }
 
 var html2txt = function (html) {
@@ -339,15 +345,15 @@ class EpubMeta{
     }
 
     opf(){
-        return new EpubOpf("content.opf", this)
+        return new EpubOpf(opf_file_name, this)
     }
 
     ncx(){
-        return new EpubNcx("content.ncx", this)
+        return new EpubNcx(ncx_file_name, this)
     }
 
     nav(){
-        return new EpubNav("content.xhtml", this)
+        return new EpubNav(nav_file_name, this)
     }
 }
 
@@ -365,7 +371,7 @@ class EpubWriter{
 `<?xml version='1.0' encoding='utf-8'?>
 <container xmlns="urn:oasis:names:tc:opendocument:xmlns:container" version="1.0">
     <rootfiles>
-    <rootfile media-type="application/oebps-package+xml" full-path="EPUB/content.opf"/>
+    <rootfile media-type="application/oebps-package+xml" full-path="EPUB/${opf_file_name}"/>
     </rootfiles>
 </container>
 `       );