<button >改变内容</button>
<div >要改变的内容</div>
<script type="text/javascript">
document.getElementById("click").onclick=function(){
var text=document.getElementById("t");
var val=text.innerHTML;
text.innerHTML="<input type='text' id='n' value="+val+" />";
document.getElementById("n").addEventListener("blur",function(e){
text.innerHTML=document.getElementById("n").value;
});
};
</script>