<textarea class="form-control" id="brief" name="brief" cols=10 rows=6 placeholder="">Java</textarea>
<textarea class="form-control" id="brief" name="brief" cols=10 rows=6 placeholder="">{{study.get('brief','')}}</textarea>
<script>
    var content= $("#brief").val();          // 获取 textarea 标签的值     
    console.log(content);            // Java
    $("#brief").val("Python");               // 设置 textarea 标签的值 
    console.log($("#brief").val());  // Python
</script>