[backend] fix: 修复异常处理和类型转换问题

frontend/node_modules/rc-table/lib/utils/offsetUtil.js

@@ -0,0 +1,19 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getOffset = getOffset;
+var _findDOMNode = require("rc-util/lib/Dom/findDOMNode");
+// Copy from `rc-util/Dom/css.js`
+function getOffset(node) {
+  var element = (0, _findDOMNode.getDOM)(node);
+  var box = element.getBoundingClientRect();
+  var docElem = document.documentElement;
+
+  // < ie8 not support win.pageXOffset, use docElem.scrollLeft instead
+  return {
+    left: box.left + (window.pageXOffset || docElem.scrollLeft) - (docElem.clientLeft || document.body.clientLeft || 0),
+    top: box.top + (window.pageYOffset || docElem.scrollTop) - (docElem.clientTop || document.body.clientTop || 0)
+  };
+}