diff --git a/src/Flows.js b/src/Flows.js
index a95c255..bfd1c4d 100644
--- a/src/Flows.js
+++ b/src/Flows.js
@@ -42,7 +42,7 @@ function load_single_meta(show_sidebar,token) {
                 )
             })
             .catch((e)=>{
-                console.trace(e);
+                console.error(e);
                 show_sidebar(
                     '帖子详情',
                     <div className="box box-tip">
@@ -136,7 +136,7 @@ class FlowSidebar extends PureComponent {
                 });
             })
             .catch((e)=>{
-                console.trace(e);
+                console.error(e);
                 this.setState({
                     replies: [],
                     loading_status: 'done',
@@ -164,23 +164,43 @@ class FlowSidebar extends PureComponent {
                     loading_status: 'done'
                 });
                 alert('设置关注失败');
-                console.trace(e);
+                console.error(e);
             });
     }
 
+    report() {
+        let reason=prompt(`举报 #${this.state.info.pid} 的理由：`);
+        if(reason!==null) {
+            API.report(this.state.info.pid,reason,this.props.token)
+                .then((json)=>{
+                    alert('举报成功');
+                })
+                .catch((e)=>{
+                    alert('举报失败');
+                    console.error(e);
+                })
+        }
+    }
+
     render() {
         if(this.state.loading_status==='loading')
             return (<p className="box box-tip">加载中……</p>);
         return (
             <div className="flow-item-row sidebar-flow-item">
                 <div className="box box-tip">
+                    {this.props.token &&
+                        <span>
+                            <a onClick={this.report.bind(this)}>举报</a>
+                            &nbsp;/&nbsp;
+                        </span>
+                    }
                     <a onClick={this.load_replies.bind(this)}>刷新回复</a>
                     {this.props.token &&
                         <span>
                             &nbsp;/&nbsp;
-                        <a onClick={()=>{
-                            this.toggle_attention();
-                        }}>
+                            <a onClick={()=>{
+                                this.toggle_attention();
+                            }}>
                                 {this.state.attention ?
                                     <span><span className="icon icon-star-ok" />&nbsp;已关注</span> :
                                     <span><span className="icon icon-star" />&nbsp;未关注</span>
@@ -239,7 +259,7 @@ class FlowItemRow extends PureComponent {
                 }),callback);
             })
             .catch((e)=>{
-                console.trace(e);
+                console.error(e);
                 this.setState({
                     replies: [],
                     reply_status: 'failed',
@@ -312,7 +332,7 @@ export class Flow extends PureComponent {
 
     load_page(page) {
         const failed=(err)=>{
-            console.trace(err);
+            console.error(err);
             this.setState((prev,props)=>({
                 loaded_pages: prev.loaded_pages-1,
                 loading_status: 'failed',
diff --git a/src/UserAction.js b/src/UserAction.js
index 12b74d3..1f2512c 100644
--- a/src/UserAction.js
+++ b/src/UserAction.js
@@ -60,7 +60,7 @@ export class LoginForm extends Component {
                 this.setState({
                     loading_status: 'done',
                 });
-                console.trace(e);
+                console.error(e);
             });
     }
 
@@ -162,7 +162,7 @@ export class ReplyForm extends Component {
                 this.props.on_complete();
             })
             .catch((e)=>{
-                console.trace(e);
+                console.error(e);
                 alert('回复失败\n（树洞服务器经常抽风，其实有可能已经回复上了，不妨点“刷新回复”看一看）');
                 this.setState({
                     loading_status: 'done',
@@ -236,7 +236,7 @@ export class PostForm extends Component {
                 this.props.on_complete();
             })
             .catch((e)=>{
-                console.trace(e);
+                console.error(e);
                 alert('发表失败');
                 this.setState({
                     loading_status: 'done',
diff --git a/src/flows_api.js b/src/flows_api.js
index c33061b..2d85ddd 100644
--- a/src/flows_api.js
+++ b/src/flows_api.js
@@ -54,6 +54,29 @@ export const API={
             });
     },
 
+    report: (pid,reason,token)=>{
+        let data=new URLSearchParams();
+        data.append('token',token);
+        data.append('action','report');
+        data.append('pid',pid);
+        data.append('reason',reason);
+        return fetch(API_BASE+'/api.php', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/x-www-form-urlencoded',
+            },
+            body: data,
+        })
+            .then((res)=>res.json())
+            .then((json)=>{
+                if(json.code!==0) {
+                    if(json.msg) alert(json.msg);
+                    throw new Error(json);
+                }
+                return json;
+            });
+    },
+
     get_list: (page,token)=>{
         return fetch(
             API_BASE+'/api.php?action=getlist'+