fix: 修改层级问题

package.json

 {
   "name": "@gic-test/vue-gic-img-preview",
   "description": "vue-gic-img-preview Plugin",
-  "version": "1.0.12",
+  "version": "1.0.13",
   "license": "MIT",
   "private": false,
   "author": "fairyly",

src/lib/vue-gic-img-preview.vue

@@ -51,7 +51,7 @@ export default {
     this.showFlag = that.imgShowFlag;
 
     // 监听点击隐藏弹层
-    document.addEventListener('click', that.hidePanel, false)
+    document.addEventListener('mousedown', that.hidePanel, false)
   }
 }
 </script>
@@ -70,7 +70,7 @@ export default {
     left: 50%;
     -webkit-transform: translate(-50%, -50%);
     transform: translate(-50%, -50%);
-    z-index: 5000;
+    z-index: 50;
     display: -webkit-flex;
     display: flex;
     justify-content: center;