咦，为什么不行
function replaceMessage(){
var oldnode=document.getElementById("oldnode");
var newnode=document.createElement("i");
newnode.innerHTML=oldnode.innerHTML;
oldnode.parentNode.replaceChlid(newnode,oldnode);
}
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function replaceMessage(){
var oldnode=document.getElementById("oldnode");
var newnode=document.createElement("i");
newnode.innerHTML=oldnode.innerHTML;
oldnode.parentNode.replaceChlid(newnode,oldnode);
}
2019-05-02
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