这问题就是很简单,如标题所说:Safari输入框被输入法阻挡fixed失效。
经过搜搜,stackoverflow找到了解决方案:

html,body{
-webkit-overflow-scrolling : touch !important;
overflow: auto !important;
height: 100% !important;
}

http://stackoverflow.com/questions/29001977/safari-in-ios8-is-scrolling-screen-when-fixed-elements-get-focus

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