在查看了另一个答案之后，似乎我也需要在每次调用时都传递id字段，否则它将禁用输入。

修复它的示例代码：

$('.select2').select2({  placeholder: "Policy Name",  minimumInputLength: 3,  multiple: false,  quietMillis: 100,  id: function(bond){ return bond._id; },  ajax: {    url: "http://localhost:3000/search",    dataType: 'json',    type: 'POST',    data: function(term, page) {      return {        search: term,        page: page || 1      }    },    results: function(bond, page) {      return {results: bond.results, more: (bond.results && bond.results.length == 10 ? true: false)}    }  },  formatResult: formatResult,  formatSelection: formatSelection,  initSelection: initSelection})

编辑

既然这总是被推崇，我会详细说明。.select2（）方法期望

id

id

function( <INDIVIDUAL_RESULT> ) {  // Expects you to return a unique identifier.  // Ideally this should be from the results of the $.ajax() call. }

由于我的唯一标识符是

<RESULT>._id

return <RESULT>._id;