diff --git a/src/drag/core.js b/src/drag/core.js
index fe8dbb2..6130e89 100644
--- a/src/drag/core.js
+++ b/src/drag/core.js
@@ -4,14 +4,47 @@
  * @date 2019/08/21 17:28:40
  */
 
-"use strict";
+'use strict'
 
-export default Drag {
-  constructor(elem){
+import { bind, unbind } from '../utils'
+
+const log = console.log
+
+const DEF_OPT = {
+  axis: '', // x | y | xy 拖拽方向
+  limit: false, // false | window | parent 拖拽范围
+  overflow: true // 是否可拖拽出可视区外
+}
+
+export default class Drag {
+  constructor(elem) {
     this.$elem = elem
   }
 
-  by(node){
-    
+  // drag by
+  by(node, opt = {}) {
+    this.$drag = node
+    this.opt = Object.assign(Object.create(null), DEF_OPT, opt)
+
+    //
+    if (this.opt.limit !== false) {
+      this.opt.overflow = false
+    }
+
+    // 鼠标状态图标
+    var ico = document.documentMode ? 'move' : 'grab'
+    if (window.sidebar) {
+      ico = '-moz-' + ico
+    } else {
+      ico = '-webkit-' + ico
+    }
+    this.$drag.style.cursor = ico
+
+    bind(this.$drag, 'mousedown', ev => {
+      var bcr = this.$elem.getBoundingClientRect()
+      log(bcr)
+    })
+
+    return this
   }
-}
\ No newline at end of file
+}
diff --git a/src/layer/next.wc b/src/layer/next.wc
index cddeda5..872e084 100644
--- a/src/layer/next.wc
+++ b/src/layer/next.wc
@@ -112,7 +112,7 @@
 </style>
 
 <script>
-import '../drag/index'
+import Drag from '../drag/core'
 
 import { nextTick, bind, unbind, clickOutside } from '../utils'
 
@@ -634,6 +634,7 @@ const _layer = {
     l.setAttribute('mask', '')
     l.innerHTML = '<p>ffdfdffd</p>'
     document.body.appendChild(l)
+    new Drag(l.root.children[1]).by(l.__TITLE__)
     return _layer.open(opt)
   },
   confirm(content, title, yescb, nocb) {