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var ot2='<div class="input-group" style="z-index:100;position: relative;">'+
'<span class="input-group-addon" for="usertype">约束条件</span>'+
'<select id="usertype" class="form-control selectpicker" multiple="multiple">'+
'<option value="1">1</option>'+
'<option value="2">2</option>'+
'</select></div>'
$("#"+empty_id).append(ot2);