cocos creator 动态加载字体

···
cc.log("testLb = ", this.testLb)

    var self = this
    cc.loader.loadRes("fnt/Nunito-Bold", cc.TTFFont, function (err, cc_ttffont) {
        if (err) cc.log(err)
        cc.log("cc_ttffont = ", cc_ttffont)
        self.testLb.font = cc_ttffont;
    });

···