Fix: 修复toast关闭时未移除Dom节点，以及补上单元测试 (#19)

* 文档页样式和打包配置优化

* upload unit test

* intanbul ignore src/index

* unit test

* utils dom unit test

* fix: toast not remove

* remove dom unit test

* remove toast clear unit test

* remove toast import vue

packages/toast/src/toast.js

@@ -14,6 +14,7 @@ const getInstance = () => {
 };
 
 const removeDom = event => {
+  /* istanbul ignore else */
   if (event.target.parentNode) {
     event.target.parentNode.removeChild(event.target);
   }
@@ -69,6 +70,7 @@ Toast.fail = (options) => {
 };
 
 Toast.clear = () => {
+  /* istanbul ignore else */
   if (instance) instance.clear();
 };