JavaScript 全选函数的实现

<table id="purchase-info" class="table table-bordered table-hover table-striped" cellspacing="0"  width="100%" align="center">
       <caption>采购清单</caption>
       <thead>
       <tr>
           <td><input class="allChoose" type="checkbox" onclick="selectAll()"></td>
           <th>物品编号</th>
           <th>物品名称</th>
           <th>物品分类</th>
           <th>规格型号</th>
           <th>供应商</th>
           <th>采购人员</th>
           <th>采购数量</th>
           <th>备注</th>
           <th>入库操作</th>
       </tr>
       </thead>

       <tbody id="purchase-item">
    
       <tr>
           <td><input class="choose" type="checkbox"/></td>
           <td>001</td>
           <td>真彩水性笔</td>
           <td>文具</td>
           <th>盒（12支）</th>
           <th>上海真彩文具店</th>
           <th>小王</th>
           <th>50</th>
           <th>无备注</th>
           <td><button id="inStorage">入库</button></td>
       </tr>
       <tr>
           <td><input class="choose" type="checkbox"/></td>
           <td>001</td>
           <td>真彩水性笔</td>
           <td>文具</td>
           <th>盒（12支）</th>
           <th>上海真彩文具店</th>
           <th>小王</th>
           <th>50</th>
           <th>无备注</th>
           <td><button id="inStorage">入库</button></td>
       </tr>
  </tbody>
</table>

//全选功能函数
function selectAll(){
    var allChoose=document.getElementsByClassName("allChoose")[0];
    var list=document.getElementsByClassName("choose");
    if(allChoose.checked){
        for(var i= 0;i<list.length;i++){
            list[i].checked=true;
        }
        return true;
    }else{
        for(var i=0;i<list.length;i++){
            list[i].checked=false;
        }
        return false;
    }
}