fix toptips bug (#21)

#20

dist/toptips/index.js

@@ -1,11 +1,10 @@
-var timer = undefined;
-
 module.exports = {
   showZanTopTips(content = '', options = {}) {
+    let zanTopTips = this.data.zanTopTips || {};
     // 如果已经有一个计时器在了，就清理掉先
-    if (timer) {
+    if (zanTopTips.timer) {
-      clearTimeout(timer);
+      clearTimeout(zanTopTips.timer);
-      timer = undefined;
+      zanTopTips.timer = undefined;
     }
 
     if (typeof options === 'number') {
@@ -19,21 +18,22 @@ module.exports = {
       duration: 3000
     }, options);
 
+    // 设置定时器，定时关闭topTips
+    let timer = setTimeout(() => {
+      this.setData({
+        'zanTopTips.show': false,
+        'zanTopTips.timer': undefined
+      });
+    }, options.duration);
+
     // 展示出topTips
     this.setData({
       zanTopTips: {
         show: true,
         content,
-        options
+        options,
+        timer
       }
     });
-
-    // 设置定时器，定时关闭topTips
-    timer = setTimeout(() => {
-      this.setData({
-        'zanTopTips.show': false
-      });
-      timer = undefined;
-    }, options.duration);
   }
 };