jQuery to achieve the drop-down box is checked by default

<form class="form-inline" method="post" action="/score_result/">
        <input type="hidden" name="csrfmiddlewaretoken" value="UIbksfQRejaZFuAByesMRE9rtyGZgfJmUWRyONLqF121IqjkunGxnihnMAbvrOE3">
        <div class="form-group">
            <label for="exampleInputEmail2">选款批次：</label>
            
            <select name="selection_batch" id="selection_batch" class="form-control">
                
                    <option value="0814">0814</option>
                
                    <option value="0808">0808</option>
                
                    <option value="0810">0810</option>
                
                    <option value="0811">0811</option>
                
                    <option value="0807">0807</option>
                
            </select>
        </div>
        <div class="form-group">
            <label for="exampleInputName2">类目：</label>
            <select name="category" id="category" class="form-control">
                
                    <option value="小脚裤">小脚裤</option>
                
                    <option value="阔腿裤">阔腿裤</option>
                
                    <option value="Skirts " the Option</Skirts>> 
                
                    < Option value = "pants" > pants </ Option > 
                
                    < Option value = "Harlan pants" > Harlan pants </ Option > 
                
                    < Option value = "denim jacket" > denim jacket </ Option > 
                
                    < Option value = "overalls" > overalls </ Option > 
                
            </ SELECT > 
        </ div > 
        < Button type = "Submit"class = "btn btn-default" > query results</button>
    </form>

    <script>
        // 批次号默认选中
        $('select#selection_batch').find('option').each(
            function () {
                if ($(this).val() == '{{ selection_batch_post }}') {
                    $(this).attr("selected", "selected");
                }
            }
        )
    </script>