javascript - 使用 Enquire.js 和 Vue.js 来查询浏览器的大小

Question

我正在使用Enquire.js和Vue.js来查询浏览器的大小并相应地更新两个数据属性。所以，如果我这样做：

ready: function() {
    // Listen for changes in the browser's size
    window.addEventListener("resize",
    enquire.register("screen and (max-width:400px)", {
        match: function() {
            this.displayIsLarge = false;
            this.displayIsSmall = true;
            console.log("the screen is now small");
        },
        unmatch: function() {
            this.displayIsLarge = true;
            this.displayIsSmall = false;
            console.log("the screen is now large");
        }
    })
    );
}

它将在控制台中输出正确的消息（此处为 jsfiddle ），但不会更改displayIsLargeand的值displayIsSmall。我在这里想念什么？

Answer 1

问题在于this. 完整的工作代码是：

ready: function() {
    var self = this;
    // Listen for changes in the browser's size
    window.addEventListener("resize",
    enquire.register("screen and (max-width:400px)", {
        match: function() {
            self.displayIsSmall = true;
            self.displayIsLarge = false;
            console.log("the screen is now small");
        },
        unmatch: function() {
            self.displayIsLarge = true;
            self.displayIsSmall = false;
            console.log("the screen is now large");
        }
    })
    );
}

Jsfiddle在这里