fixed test bug #1
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查询了相关的文档，attachTo的作用是将特定的组件挂在指定的文档元素中。之前没有使用attachTo时，HelloWorld这个组件没有挂载到文档中，导致了template中的HTMLElement没有出现在document中，有点像document.createFragment创建了dom片段，但是没有真正的挂在到document中。在这种情况下，针对于HelloWorld中元素设置的事件代理其实就相当于对页面中一个不存在的元素进行事件代理的设置，所以click事件的addEventListener的回调是不会响应的。 |
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修改jest测试，想想为啥这样改就可以呢？