I want to insert a node as a child node (element node ) at 开发者_运维知识库a fixed position(0) i.e. it should replace a child node (if there is one) and not append..
Which function should I use to ensure crossbrowser compatiblity?
Test to see if the element has a firstChild. If it has one, use replaceChild otherwise use appendChild
Select the child and use .replaceWith()
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
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