fix: 浏览器IE拖拽不好使

demo/index-demo-base.js

@@ -1,3 +1,4 @@
+import polyfill from '@babel/polyfill'
 import React, { Component } from 'react';
 import ReactDOM from 'react-dom';
 import { Con, Row, Col } from 'bee-layout';

demo/index.js

@@ -1,3 +1,4 @@
+import polyfill from '@babel/polyfill'
 import React, { Component } from 'react';
 import ReactDOM from 'react-dom';
 import { Con, Row, Col } from 'bee-layout';

package.json

@@ -74,6 +74,7 @@
   "prop-types": "^15.6.0"
  },
  "devDependencies": {
+  "@babel/polyfill": "^7.12.1",
   "babel-jest": "^22.0.4",
   "bee-clipboard": "^2.0.0",
   "bee-drawer": "0.0.2",

src/TableHeader.js

@@ -273,7 +273,7 @@ class TableHeader extends Component {
       }
       let currentObj = this.table.cols[currentIndex];
       this.drag.currIndex = currentIndex;
-      this.drag.oldLeft = event.x;
+      this.drag.oldLeft = event.clientX;
       this.drag.oldWidth = parseInt((currentObj).style.width);
       this.drag.minWidth = currentObj.style.minWidth != ""?parseInt(currentObj.style.minWidth):defaultWidth;
       this.drag.tableWidth = parseInt(this.table.table.style.width ?this.table.table.style.width:this.table.table.scrollWidth);
@@ -344,7 +344,7 @@ class TableHeader extends Component {
     if(this.props.dragborder && this.drag.option == "border"){
       //移动改变宽度
       let currentCols = this.table.cols[this.drag.currIndex];
-      let diff = (event.x - this.drag.oldLeft);
+      let diff = (event.clientX - this.drag.oldLeft);
       let newWidth = this.drag.oldWidth + diff;
       this.drag.newWidth = newWidth > 0 ? newWidth : this.minWidth;
       if(newWidth > this.minWidth){