引入外掛

 <script src="/fontfaceobserver-master/fontfaceobserver.js"></script>

css引入字型

<style>         
        @font-face {
            font-family:博洋草體二;
            src:url('/fonts/art/bycte.ttf') format("truetype");
        }
</style>

映入js

function loadFont(font){
    //canvas.getActiveObject().set("fontFamily","方正小篆體");
 

     var myfont = new FontFaceObserver(font);
      myfont.load()
        .then(function() {
          // when font is loaded, use it.
          canvas.getActiveObject().set("fontFamily", font);
          canvas.requestRenderAll();
        }).catch(function(e) {
          console.log(e);
        });
}