获取页面内容封装成json对象

function(params, dom){
　　var courseName= document.getElementsByName("courseName");
　　var teacherName = document.getElementsByName("teacherName");
　　var courseId = document.getElementsByName("courseId");
　　var courseList = [];
　　for(var i=0; i< courseName.length; i++){
　　if(courseId.length > i){
　　var id = courseId[i].value;
　　}
　　else id = '';
　　var course = { "id": id, "name":courseName[i].value,"teacherName":teacherName[i].value};
　　courseList.push(course);
　　}
　　console.info(courseList);
　　params.courseList = courseList;
　　params = {data:JSON.stringify(params)};
　　return params;
}