diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..33634b7
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+  "cSpell.words": [
+    "callout",
+    "unenumerable"
+  ]
+}
\ No newline at end of file
diff --git a/doc/UTIL_API.md b/doc/UTIL_API.md
index 5eb2d8f..abde9d3 100644
--- a/doc/UTIL_API.md
+++ b/doc/UTIL_API.md
@@ -966,6 +966,21 @@ cookie.get('a'); // -> '1'
 cookie.remove('a');
 ```
 
+## copy 
+
+Copy text to clipboard using document.execCommand.
+
+|Name|Type    |Desc             |
+|----|--------|-----------------|
+|text|string  |Text to copy     |
+|[cb]|function|Optional callback|
+
+```javascript
+copy('text', function (err) {
+    // Handle errors.
+});
+```
+
 ## createAssigner 
 
 Used to create extend, extendOwn and defaults.
diff --git a/src/Console/Console.js b/src/Console/Console.js
index 2fe63df..8bd0d30 100644
--- a/src/Console/Console.js
+++ b/src/Console/Console.js
@@ -57,6 +57,9 @@ export default class Console extends Tool {
 
     return this
   }
+  setGlobal(name, val) {
+    this._logger.setGlobal(name, val)
+  }
   restoreConsole() {
     if (!this._origConsole) return this
 
diff --git a/src/Console/Logger.js b/src/Console/Logger.js
index b63e70d..0350e38 100644
--- a/src/Console/Logger.js
+++ b/src/Console/Logger.js
@@ -14,7 +14,11 @@ import {
   $,
   Stack,
   isEmpty,
-  contain
+  contain,
+  copy,
+  each,
+  toArr,
+  keys
 } from '../lib/util'
 
 export default class Logger extends Emitter {
@@ -32,8 +36,35 @@ export default class Logger extends Emitter {
     this._displayHeader = false
     this._groupStack = new Stack()
 
+    // https://developers.google.cn/web/tools/chrome-devtools/console/utilities
+    this._global = {
+      copy(value) {
+        if (!isStr(value)) value = JSON.stringify(value, null, 2)
+        copy(value)
+      },
+      $() {
+        return document.querySelector.apply(document, arguments)
+      },
+      $$() {
+        return toArr(document.querySelectorAll.apply(document, arguments))
+      },
+      clear: () => {
+        this.clear()
+      },
+      dir: value => {
+        this.dir(value)
+      },
+      table: (data, columns) => {
+        this.table(data, columns)
+      },
+      keys
+    }
+
     this._bindEvent()
   }
+  setGlobal(name, val) {
+    this._global[name] = val
+  }
   displayHeader(flag) {
     this._displayHeader = flag
   }
@@ -186,7 +217,7 @@ export default class Logger extends Emitter {
     })
 
     try {
-      this.output(evalJs(jsCode))
+      this.output(this._evalJs(jsCode))
     } catch (e) {
       this.insert({
         type: 'error',
@@ -291,6 +322,34 @@ export default class Logger extends Emitter {
 
     el.scrollTop = el.scrollHeight - el.offsetHeight
   }
+  _injectGlobal() {
+    each(this._global, (val, name) => {
+      if (window[name]) return
+
+      window[name] = val
+    })
+  }
+  _clearGlobal() {
+    each(this._global, (val, name) => {
+      if (window[name] && window[name] === val) {
+        delete window[name]
+      }
+    })
+  }
+  _evalJs(jsInput) {
+    let ret
+
+    this._injectGlobal()
+    try {
+      ret = eval.call(window, `(${jsInput})`)
+    } catch (e) {
+      ret = eval.call(window, jsInput)
+    }
+    this.setGlobal('$_', ret)
+    this._clearGlobal()
+
+    return ret
+  }
   _rmLogUi(log) {
     const $container = this._$el.find(`li[data-id="${log.id}"]`)
     if ($container.length > 0) {
@@ -413,15 +472,3 @@ export default class Logger extends Emitter {
       })
   }
 }
-
-const evalJs = jsInput => {
-  let ret
-
-  try {
-    ret = eval.call(window, `(${jsInput})`)
-  } catch (e) {
-    ret = eval.call(window, jsInput)
-  }
-
-  return ret
-}
diff --git a/src/lib/util.js b/src/lib/util.js
index ed4a86a..bbf3b48 100644
--- a/src/lib/util.js
+++ b/src/lib/util.js
@@ -3710,6 +3710,63 @@ export var clone = _.clone = (function (exports) {
     return exports;
 })({});
 
+/* ------------------------------ copy ------------------------------ */
+
+export var copy = _.copy = (function (exports) {
+    /* Copy text to clipboard using document.execCommand.
+     *
+     * |Name|Type    |Desc             |
+     * |----|--------|-----------------|
+     * |text|string  |Text to copy     |
+     * |[cb]|function|Optional callback|
+     */
+
+    /* example
+     * copy('text', function (err) {
+     *     // Handle errors.
+     * });
+     */
+
+    /* typescript
+     * export declare function copy(text: string, cb?: Function): void;
+     */
+
+    /* dependencies
+     * extend noop 
+     */
+
+    exports = function(text, cb) {
+        cb = cb || noop;
+        var el = document.createElement('textarea');
+        var body = document.body;
+        extend(el.style, {
+            fontSize: '12pt',
+            border: '0',
+            padding: '0',
+            margin: '0',
+            position: 'absolute',
+            left: '-9999px'
+        });
+        el.value = text;
+        body.appendChild(el); // Prevent showing ios keyboard.
+
+        el.setAttribute('readonly', '');
+        el.select();
+        el.setSelectionRange(0, text.length);
+
+        try {
+            document.execCommand('copy');
+            cb();
+        } catch (e) {
+            cb(e);
+        } finally {
+            body.removeChild(el);
+        }
+    };
+
+    return exports;
+})({});
+
 /* ------------------------------ map ------------------------------ */
 
 export var map = _.map = (function (exports) {