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问题描述

我如何做到这一点，当我按下 F 键时，它会出现，但当我再次按下它时，它就会消失。这可以通过 Java 完成吗？

javascript: (function () {
var head = document.head || document.getElementsByTagName("head")[0];
var body = document.body || document.getElementsByTagName("body")[0];
var counter = document.createElement("div");
counter.setAttribute("id","fpscounter");
counter.setAttribute("class","fpscounter");
var style = document.createElement("style");
var css =
    ".fpscounter { position: fixed; z-index: 9999999; bottom: 10px; right: 10px; min-width: 40px; padding: 5px 10px; background-color: #000000; font-family: 'Arial'; font-size: 24px; font-weight: normal; color: #00ff00; text-align: center; border-radius: 5px; }";
style.type = "text/css";
if (style.styleSheet) {
    style.styleSheet.csstext = css;
} else {
    style.appendChild(document.createTextNode(css));
}
head.appendChild(style);
body.appendChild(counter);
var measure = (function () {
    var measurements = [];
    var sixtyFramesAgo,Now,fps;
    var counter = document.getElementById("fpscounter");
    return function () {
        Now = new Date().getTime();
        measurements.push(Now);
        if (measurements.length >= 75) {
            measurements = measurements.slice(measurements.length - 61);
            sixtyFramesAgo = measurements[0];
            fps = Math.floor(60 / ((Now - sixtyFramesAgo) / 1000));
            counter.textContent = fps;
        }
        window.requestAnimationFrame(measure);
    };
})();
measure();

解决方法

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