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我正在使用物化設計和麪料js庫。我想在畫布中更改文字的字體樣式。在實現設計之前，我使用了bootstrap，然後它工作正常。但現在我正在使用bootstrap的物化設計位置，然後我的下拉式不起作用。下拉式不適用於面料js的物化設計
無實質性設計（下拉工作正常）。
var canvas = new fabric.Canvas('canvas');
$('#font').change(function(){
var obj = canvas.getActiveObject();
if(obj){
obj.setFontFamily($(this).val());
}
canvas.renderAll();
});
function addText() {
var oText = new fabric.IText('Tap and Type', {
left: 100,
top: 100 ,
});
canvas.add(oText);
canvas.setActiveObject(oText);
$('#fill, #font').trigger('change');
oText.bringToFront();
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>
<button class="btn" onclick="addText()">Add Custom Text</button>
<select id="font">
<option>arial</option>
<option>tahoma</option>
<option>times new roman</option>
</select>
<br />
<canvas id="canvas" width="750" height="550" style="border:1px solid #333"></canvas>與物化設計（下拉不工作）。
var canvas = new fabric.Canvas('canvas');
$('#font').change(function(){
var obj = canvas.getActiveObject();
if(obj){
obj.setFontFamily($(this).val());
}
canvas.renderAll();
});
function addText() {
var oText = new fabric.IText('Tap and Type', {
left: 100,
top: 100 ,
});
canvas.add(oText);
canvas.setActiveObject(oText);
$('#fill, #font').trigger('change');
oText.bringToFront();
}<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/css/materialize.min.css">
<!-- Compiled and minified JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/js/materialize.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>
<div class="container">
<div class="row">
<div class="col s12">
<button class="btn" onclick="addText()">Add Custom Text</button>
<select id="font">
<option>arial</option>
<option>tahoma</option>
<option>times new roman</option>
</select>
<br />
<canvas id="canvas" width="750" height="550" style="border:1px solid #333"></canvas>
</div>
</div>
</div>我想使用布JS兌現的設計。我想在畫布中更改文字的字體樣式。