前端知识控制input按钮的显示与隐藏

1   if(fm.ReadFlag.value=="readonly"){
2         var arr = document.getElementsByTagName("input")
3         for (var int =0; int < arr.length ; int ++){
4             arr[int].disabled = true;
5         }
6         document.getElementById("addPlan").hidden = true;
7         document.getElementById("updatePlan").hidden = true;
8         document.getElementById("closeButton").disabled = false;
9     }