<table id="example" class="table table-border table-bordered table-bg table-hover table-sort"> 
 <thead> 
 <tr class="text-c"> 
  <th width="25"> 
  <input type="checkbox" name="checkAll" class="checkall" onclick="checkedClean();"> 
  </th> 
  <th width="100">名称</th> 
  <th width="100">说明</th> 
  <th width="100">类型</th> 
  <th width="60">是否默认</th> 
  <th width="20">状态</th> 
  <th width="100"></th> 
 </thead> 
 <tbody> 
 </tbody> 
</table> 

#example{ 
 width: 100% !important; 
} 

#example{ 
 width: ***px !important; 
}