JS怎样利用按钮实现在Text框所输入过的内容做撤消和重做的操作
撤消是指上一步,不是reset按钮,重做是下一步
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<input type= "text ">
<input type= "button " value= "undo " onclick= "document.execCommand( 'Undo '); ">
<input type= "button " value= "redo " onclick= "document.execCommand( 'Redo '); ">