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Element.classList.add这个方法的参数可以(String[,String])，但是Android 4.4 才支持这么做，所以再weex-html5的weex.js中,Confirm按多个类的方式一次性追加失败，导致后面的样式找不到对应的元素，弹窗布局就难看啦。改为逐个添加。
Element.classList.add
(String[,String])
Android 4.4
weex-html5
weex.js
Confirm
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