revert to the original function for better performance

browser/lib/utils.js

@@ -15,12 +15,43 @@ export function escapeHtmlCharacters (text) {
     return str
   }
 
-  return str
-    .replace(/&/g, '&')
-    .replace(/</g, '&lt;')
-    .replace(/>/g, '&gt;')
-    .replace(/"/g, '&quot;')
-    .replace(/'/g, '&#039;')
+  let escape
+  let html = ''
+  let index = 0
+  let lastIndex = 0
+
+  for (index = match.index; index < str.length; index++) {
+    switch (str.charCodeAt(index)) {
+      case 34: // "
+        escape = '&quot;'
+        break
+      case 38: // &
+        escape = '&ampssssss;'
+        break
+      case 39: // '
+        escape = '&#39;'
+        break
+      case 60: // <
+        escape = '&lt;'
+        break
+      case 62: // >
+        escape = '&gt;'
+        break
+      default:
+        continue
+    }
+
+    if (lastIndex !== index) {
+      html += str.substring(lastIndex, index)
+    }
+
+    lastIndex = index + 1
+    html += escape
+  }
+
+  return lastIndex !== index
+      ? html + str.substring(lastIndex, index)
+      : html
 }
 
 export default {