Fixed an issue when clicking "line Number cell" did not start the next task.

Author: thomasJang

src/axui-datagrid/components/DataGridBody.tsx

@@ -58,7 +58,7 @@ class DataGridBody extends React.Component<IProps> {
     } = styles;
 
     const startMousePosition = getMousePosition(e);
-    const spanType = e.currentTarget.getAttribute('data-span');
+    const spanType = e.target['getAttribute']('data-span');
     const rootNode = getNode(getRootNode);
     const { x: leftPadding = 0, y: topPadding = 0 } =
       rootNode && (rootNode.getBoundingClientRect() as any);
@@ -342,7 +342,7 @@ class DataGridBody extends React.Component<IProps> {
         document.addEventListener('mouseleave', offEvent);
       }
     };
-    const procClickLinenumber = () => {
+    const procClickLineNumber = () => {
       let state = {
         dragging: false,
         selectionRows: {},
@@ -398,7 +398,7 @@ class DataGridBody extends React.Component<IProps> {
 
     switch (spanType) {
       case 'lineNumber':
-        procClickLinenumber();
+        procClickLineNumber();
         break;
       case 'rowSelector':
         procClickRowSelector();

src/axui-datagrid/components/DataGridBodyCell.tsx

@@ -13,8 +13,7 @@ const CellLabel: React.SFC<{
 }> = props => {
   const { col, list: data, li, lineHeight, predefinedFormatter } = props;
   const { key = '', columnAttr = '', formatter } = col;
-
-  let formatterData = {
+  const formatterData = {
     data,
     item: data[li],
     index: li,