学校系统快速js代码

var select_arr=document.getElementById("iframeautoheight").contentWindow.document.getElementsByTagName("select");for(var i=1;i<select_arr.length;i++){select_arr[i].value="B";if(i==6){select_arr[i].value="A";}};document.getElementById("iframeautoheight").contentWindow.document.getElementById("Button1").click();