diff --git a/components/alert/index.tsx b/components/alert/index.tsx
index c87fbc31e7..5035e8f7d3 100644
--- a/components/alert/index.tsx
+++ b/components/alert/index.tsx
@@ -29,7 +29,7 @@ export default class Alert extends React.Component {
     this.setState({
       closing: false,
     });
-    this.props.onClose.call(this, e);
+    this.props.onClose(e);
   }
   animationEnd = () => {
     this.setState({
diff --git a/components/dropdown/dropdown-button.tsx b/components/dropdown/dropdown-button.tsx
index 1aeeb067eb..c2bb4c5506 100644
--- a/components/dropdown/dropdown-button.tsx
+++ b/components/dropdown/dropdown-button.tsx
@@ -24,7 +24,7 @@ export default class DropdownButton extends React.Component {
       ['type', 'overlay', 'trigger', 'align', 'children', 'className', 'onClick']);
     const cls = classNames({
       'ant-dropdown-button': true,
-      className: !!className,
+      [className]: !!className,
     });
     return (
       <ButtonGroup {...restProps} className={cls}>
diff --git a/components/form/style/index.less b/components/form/style/index.less
index a075a67d9e..78b9907751 100644
--- a/components/form/style/index.less
+++ b/components/form/style/index.less
@@ -274,7 +274,7 @@ form {
     visibility: visible;
     font-family: "anticon" !important;
     .square(@input-height-lg);
-    line-height: @input-height-lg + 2;
+    line-height: @input-height-lg;
     text-align: center;
     font-size: 14px;
     animation: zoomIn .3s @ease-out-back;
diff --git a/components/tag/index.tsx b/components/tag/index.tsx
index 70d7a05fa1..ede10c8257 100644
--- a/components/tag/index.tsx
+++ b/components/tag/index.tsx
@@ -25,10 +25,9 @@ export default class Tag extends React.Component {
     this.props.onClose(e);
     if (e.defaultPrevented) return;
     const dom = ReactDOM.findDOMNode(this);
-    const domWidth = dom.getBoundingClientRect().width;
-    dom.style.width = `${domWidth}px`;
+    dom.style.width = `${dom.getBoundingClientRect().width}px`;
     // It's Magic Code, don't know why
-    dom.style.width = `${domWidth}px`;
+    dom.style.width = `${dom.getBoundingClientRect().width}px`;
     this.setState({
       closing: true,
     });