diff --git a/src/index.html b/src/index.html
index 12db07c..06b9192 100644
--- a/src/index.html
+++ b/src/index.html
@@ -56,7 +56,7 @@
             <span>A</span>
             <wc-input class="long" :duplex="it.value" label="请填写IP"></wc-input>
             <section>
-              <wc-switch :duplex="it.enabled"></wc-switch>
+              <wc-switch :duplex="it.enabled" @change="recordChanges(it)"></wc-switch>
               <wc-button size="mini" color="red" @active="$remove">删除</wc-button>
             </section>
             <wc-input :duplex="it.remark"></wc-input>
diff --git a/src/js/app.js b/src/js/app.js
index ec4f7e5..90f9fb6 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -19,6 +19,7 @@ const WIN = remote.getCurrentWindow()
 const $doc = Anot(document)
 
 var dict = {}
+var tmp_records = {}
 
 Anot({
   $id: 'app',
@@ -33,6 +34,7 @@ Anot({
     // this.$refs.preview.show()
     this.check()
   },
+  watch: {},
   methods: {
     addRecord() {
       log('---')
@@ -68,6 +70,17 @@ Anot({
     toggleDomain(name) {
       this.curr = name
       this.records = dict[name]
+      tmp_records = Object.create(null)
+      for (let it of this.records) {
+        if (tmp_records[it.record]) {
+          tmp_records[it.record].push(it)
+        } else {
+          tmp_records[it.record] = [it]
+        }
+      }
+      setTimeout(() => {
+        this.$refs.records.scrollTop = 0
+      }, 50)
     },
     check() {
       var check = ipcRenderer.sendSync('dns-host', { type: 'check' })
@@ -77,13 +90,34 @@ Anot({
 
         var tmp = []
         for (var k in dict) {
-          tmp.push(k)
+          if (k) {
+            tmp.push(k)
+          } else {
+            delete dict[k]
+          }
         }
         this.domains = tmp
       } else {
         this.permissionShow = true
       }
     },
-    save() {}
+    // 同一个记录, 允许一条被激活
+    recordChanges(item) {
+      if (item.enabled) {
+        if (tmp_records[item.record].length > 1) {
+          for (let it of tmp_records[item.record]) {
+            if (it.value !== item.value) {
+              it.enabled = false
+            }
+          }
+        }
+      }
+    },
+    save() {
+      if (this.curr) {
+        dict[this.curr] = this.records.$model
+        ipcRenderer.send('dns-host', { type: 'set', data: dict })
+      }
+    }
   }
 })
diff --git a/src/main.js b/src/main.js
index 186d86d..cfc347e 100644
--- a/src/main.js
+++ b/src/main.js
@@ -66,7 +66,7 @@ app.once('ready', () => {
     win = null
   })
 
-  win.openDevTools()
+  // win.openDevTools()
 
   // 然后加载应用的 index.html
   win.loadURL('app://local/index.html')
diff --git a/src/tools/init.js b/src/tools/init.js
index 9bfe86e..77531dc 100644
--- a/src/tools/init.js
+++ b/src/tools/init.js
@@ -44,7 +44,21 @@ ipcMain.on('dns-host', (ev, conn) => {
       clearTimeout(timer)
       timer = setTimeout(() => {
         fs.echo(JSON.stringify(conn.data), HOST_FILE)
-      }, 2000)
+        var txt = ''
+        for (let k in conn.data) {
+          for (let it of conn.data[k]) {
+            if (it.enabled) {
+              var name = it.record === '@' ? '' : it.record
+              if (name) {
+                name += '.'
+              }
+              txt += `${it.value.padEnd(15, ' ')}    ${name + k}\n`
+            }
+          }
+          txt += '\n\n'
+        }
+        fs.echo(txt, '/etc/hosts')
+      }, 1000)
       break
 
     case 'check':