容错处理

@@ -18,7 +18,7 @@ const removeHtml = (str) => {
  * [html转为转义]
  */
 const htmlToEscape = (html) => {
-    return html.replace(/[<>&"]/g, (e) => {
+    return (html || '').replace(/[<>&"]/g, (e) => {
         return _htmlMap[e];
 	                                                                                });
 };
@@ -27,7 +27,7 @@ const htmlToEscape = (html) => {
  * [转义符转为html]
  */
 const escapeToHtml = (str) => {
-    return str.replace(/&(lt|gt|nbsp|amp|quot);/g, (match, e) => {
+    return (str || '').replace(/&(lt|gt|nbsp|amp|quot);/g, (match, e) => {
         return _EscapeMap[e];
 	                                                                                });
 };