Select2()不是函数

所以我已经下载了 select2我把它“安装”到我的文件夹中，然后在我检查控制台(在那里我可以看到所有的脚本被加载)我可以看到文件 select2.js 的时候把它加载到我的网站上

我查看了他们的文档并复制了它，然后添加了 < code > $(“ # e9”) . select2() ;

但是当我加载这个页面时，我会得到以下错误:

TypeError: $(...).select2 is not a function




$("#e9").select2();

还有其他人经历过这种事吗？

附加信息是我的剧本:

    jQuery(document).ready(function(){
var max_amount = parseFloat($('#max_amount').val());
$( "#item_amount" ).keyup(function() {
if($(this).val() > max_amount){
$(this).val( max_amount);
}
if( /\D/.test($(this).val()) ){
alert('Må kun indeholde tal!');
$(this).val('');
}
if($(this).val()== '0'){
alert('Må ikke være 0!');
$(this).val('');
}
});
$("#e1").select2();


});
function addToBasket(){
var amount = $('#item_amount').val();
if(amount == ""){
amount = 1;
}


if(amount > 0){
$.ajax({
type: 'POST',
url: myBaseUrl + 'Products/addItemToBasket',
dataType: 'json',
data: {
id: window.location.pathname.substring(window.location.pathname.lastIndexOf('/') + 1),
amount: amount
},
success: function (data) {
var urlToBasket = myBaseUrl+'Products/basket';
var newAmount = parseInt(amount)
var price = data[0]['Product']['pris'];
var id = data[0]['Product']['id'];
var dat = data;
var tmp_basket_html = $('#basket_amount').html();
if($('#basket_amount').html() !== " Tom"){
$('#shopping_table_body').append(
"<tr id='"+id+"'>" +
"<td class='image'>" +
""+
"</td>" +
"<td class='name'>" +
" "+data[0]['Product']['name'] +
"</td>"+
"<td class='quantity'>" +
"x "+amount +""+
"</td>"+
"<td class='total'>" +
""+price*amount+
"</td>" +
""+
"<td class='remove'>" +
"<input class='icon-remove' type='button' onclick='removeItemFromBasket("+id+")'>"+
"</td>"+
"</tr>"
);
}else{
$("#shopping_menu").append(
"<ul class='dropdown-menu topcartopen'>"+
"<li id='basket_list'>"+
"<table id='shopping_table'>"+
"<tbody id='shopping_table_body'>"+
"<tr id='"+id+"'>" +
"<td class='image'>" +
""+
"</td>" +
"<td class='name'>" +
" "+data[0]['Product']['name'] +
"</td>"+
"<td class='quantity'>" +
"x "+amount +""+
"</td>"+
"<td class='total'>" +
""+price*amount+
"</td>" +
""+
"<td class='remove'>" +
"<input class='icon-remove' type='button' onclick='removeItemFromBasket("+id+")'>"+
"</td>"+
"</tr>"+
"</table>"+
"</li>"+
"<div class='well pull-right'>"+
"<input type='button' onclick='goToBasket()' class='btn btn-success' value='Tjek ud'>"+
"</div>"+
"</ul>"


)
}
updateTotal(amount,price);
updateBasketAmount();
}
});
}
Notifier.success('Vare tilføjet', 'Tilføjet'); // text and title are both optional.
}
function updateTotal(amount, price){
var price = parseFloat(price);
var oldValue = parseFloat($('#basket_total_cost').html());
var newPrice = amount*price+oldValue;
$('#basket_total_cost').html(newPrice);
}
function updateBasketAmount(){
var tmp =  $('#basket_amount').html();
if(!isNaN(tmp)){
var oldAmount = parseInt(tmp.substr(0,2));
var i = oldAmount + 1;;
$('#basket_amount').html(
""+i+" vare(r)"
);
}else{
$('#basket_amount').html(
"1"+" vare(r)"
);
}
}
function goToBasket(){
window.location.href = myBaseUrl+'Products/basket';
}