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1.当吸顶的时候增加一个div标签占位，可让过度更加顺滑（原有逻辑当到达顶部的时候会会变成绝对定位，后面的标签就会立即顶上去，会有跳动的过程，体验不佳）
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add closable props for $Modal https://github.com/iview/iview/issues/2362
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解决isInsideHiddenElement函数下parentNode.style对象的display报错的bug
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Support more types on <i-input>
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remove `on-enter` because excessive and inflexible
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Patch Chromium bug
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Don't use includes to make IE happy and avoid Polyfill
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Modal弹窗请添加on-visible-change给外部api访问
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fix issue #1846
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feat(form) : support promise for validate method #1857