//下拉列表的填充  _showSchools: function (data) { //data代表是一个数据对象                 var mySelect = document.getElementById("selectSchools"); //获取下拉框                 mySelect.options.length = 0;                 //将option添加到select标签里面                 for (var index in data) {                     var item = data[index];                     var opp = new Option(item.SchoolName, item.name);  //第一个参数代表下拉框显示的内容，第二个代表下拉框选中的内容                     opp.name = "option" + index;                     mySelect.add(opp);                 }             }, //下拉列表内容的获取 var schoolId = document.getElementById("selectSchools").value; //我们平时是选中下拉框的值是选中的内容，而不是显示的内容，如何获取显示的内容呢，下面是获取下拉框的选中的显示内容 function on_idmbzd_change(){     var sel_obj=document.getElementById("idMbzd");     var index=sel_obj.selectedIndex;     alert(sel_obj.options[index].value);     alert(sel_obj.options[index].text); } //单选按钮的内容的获取  var chkObjs = document.getElementsByName("radio");                 var checkvalue = null;                 for (var i = 0; i < chkObjs.length; i++) {                     if (chkObjs[i].checked) {                         checkvalue = parseInt(chkObjs[i].value);                     }                 } //单选按钮的设置 if (entity.SelectType == 1) document.getElementById("SelectType").checked = true; if (entity.SelectType == 0) document.getElementById("UnSelectType").checked = true; //多选框的设置 setCheckBox: function (data) {                 var courseList = document.getElementsByName("CourseList");                 for (var i = 0; i < courseList.length - 1; i++) {                     if (courseList[i].value==data) {                         courseList[i].checked=true;                     }                 }             },