update popper

examples/routers/poptip.vue

@@ -3,9 +3,18 @@
         <Tabs value="name1">
             <TabPane label="标签一" name="name1">
                 <div style="overflow: auto;width: 200px;height:300px">
+                    <Poptip title="提示标题" content="标签一的内容" placement="left" transfer :options="options">
+                        <Button id="aaa">左边</Button>
+                    </Poptip>
                     <Poptip title="提示标题" content="标签一的内容" placement="right" transfer :options="options">
                         <Button id="aaa">右边</Button>
                     </Poptip>
+                    <Poptip title="提示标题" content="标签一的内容" placement="top" transfer :options="options">
+                        <Button id="aaa">上边</Button>
+                    </Poptip>
+                    <Poptip title="提示标题" content="标签一的内容" placement="bottom" transfer :options="options">
+                        <Button id="aaa">下边</Button>
+                    </Poptip>
                 </div>
             </TabPane>
             <TabPane label="标签二" name="name2">标签二的内容</TabPane>

src/components/base/popper.js

@@ -33,6 +33,12 @@ export default {
                         computeStyle:{
                             gpuAcceleration: false,
                         }
+                    },
+                    preventOverflow :{
+                        boundariesElement: 'body',
+                    },
+                    flip :{
+                        boundariesElement: 'body',
                     }
                 };
             }
@@ -84,10 +90,10 @@ export default {
 
             options.placement = this.placement;
             
-            if (options.modifiers) {
+            if (!options.modifiers) {
                 options.modifiers = {};
             }
-            if (options.modifiers.offset) {
+            if (!options.modifiers.offset) {
                 options.modifiers.offset = {};
             }
             options.modifiers.offset = this.offset;