Fix lint in demo

Author: qiushihe

demo/demo.js

@@ -29,12 +29,6 @@ class FlowTipDemo extends Component {
     this.updateTargetProperties();
   }
 
-  updateTargetProperties() {
-    this.setState({
-      target: ReactDOM.findDOMNode(this.refs.target).getBoundingClientRect(),
-    });
-  }
-
   handleTargetMove() {
     this.updateTargetProperties();
   }
@@ -45,6 +39,12 @@ class FlowTipDemo extends Component {
     });
   }
 
+  updateTargetProperties() {
+    this.setState({
+      target: ReactDOM.findDOMNode(this.refs.target).getBoundingClientRect(),
+    });
+  }
+
   render() {
     const flowtipProperties = {
       targetOffset: 10,
@@ -99,6 +99,16 @@ class FlowTipDemo extends Component {
 class FlowTipDemoTarget extends Component {
   state = {posX: 0, posY: 0, active: true};
 
+  componentDidMount() {
+    window.addEventListener('mousemove', this.handleMouseMove.bind(this));
+    window.addEventListener('click', this.handleMouseClick.bind(this));
+  }
+
+  componentWillUnmount() {
+    window.removeEventListener('mousemove', this.handleMouseMove.bind(this));
+    window.removeEventListener('click', this.handleMouseClick.bind(this));
+  }
+
   handleMouseMove(ev) {
     if (!this.state.active) {
       return;
@@ -117,16 +127,6 @@ class FlowTipDemoTarget extends Component {
     this.setState({active: !this.state.active});
   }
 
-  componentDidMount() {
-    window.addEventListener('mousemove', this.handleMouseMove.bind(this));
-    window.addEventListener('click', this.handleMouseClick.bind(this));
-  }
-
-  componentWillUnmount() {
-    window.removeEventListener('mousemove', this.handleMouseMove.bind(this));
-    window.removeEventListener('click', this.handleMouseClick.bind(this));
-  }
-
   render() {
     const style = {
       position: 'absolute',