select2 方法

//打开下拉框

$('#id_select2_demo1').select2("open");

//获取下拉框中选中的数据

$("#id_select2_demo1").select2("data")

//清空下拉框中数据

$("#id_select2_demo1").select2("val", " ");

//赋值

$("#id_select2_demo1").val('1').trigger('change'); 或者

$("#id_select2_demo1").val("1").select2();

<div class="form-group" data-select2-id="10">
                    <label class="control-label">Demo1 - 单选Demo：</label>
                    <select class="form-control select2-hidden-accessible" id="id_select2_demo1" data-select2-id="id_select2_demo1" tabindex="-1" aria-hidden="true">
                        <option value="" data-select2-id="2">-----单选-----</option>
      <optgroup label="Group-A" data-select2-id="14">
                        <option value="1" data-select2-id="15">OPS-COFFEE-A</option>
                        <option value="2" data-select2-id="16">OPS-COFFEE-B</option>
      </optgroup>
      <optgroup label="Group-B" data-select2-id="17">
                        <option value="3" data-select2-id="18">OPS-COFFEE-C</option>
                        <option value="4" data-select2-id="19">OPS-COFFEE-D</option>
      </optgroup>
      <optgroup label="Group-C" data-select2-id="20">
                        <option value="5" data-select2-id="21">OPS-COFFEE-E</option>
                        <option value="6" data-select2-id="22">OPS-COFFEE-F</option>
      </optgroup>
                        <option value="7" data-select2-id="23">OPS-COFFEE-G</option>
                    <option value="9" selected="" data-select2-id="94">我是新加的：ops-coffee.cn</option></select><span class="select2 select2-container select2-container--default select2-container--below" dir="ltr" data-select2-id="71" style="width: 1080px;"><span class="selection"><span class="select2-selection select2-selection--single" role="combobox" aria-haspopup="true" aria-expanded="false" tabindex="0" aria-labelledby="select2-id_select2_demo1-container"><span class="select2-selection__rendered" id="select2-id_select2_demo1-container" role="textbox" aria-readonly="true" title="我是新加的：ops-coffee.cn">我是新加的：ops-coffee.cn</span><span class="select2-selection__arrow" role="presentation"><b role="presentation"></b></span></span></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>
                </div>

https://www.520mwx.com/view/67866

demo:https://www.520mwx.com/view/67866

select2 方法

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