add blockCount + 1 in add Title for fixing modification issue: new block replace parsedMd latest block

editor.js

@@ -21,8 +21,8 @@ axios.get('/公仔與爵士鼓.md').then(function(response) {
   var dataIndex;
   titleButton.onclick = function() {
     dataIndex = 0;
+    blockCount = blockCount + 1 | 0;
     const blockIndex = blockCount;
-    blockCount = blockCount + 1;
     const {blockDiv, h, titleInput, inputButton, descButton, imgButton} = getBlockElements(contentDiv);
     inputButton.onclick = function() {
       const text = titleInput.value;