当浏览器警告弹出时是否可以播放声音？

Question 1

您可以尝试使用 Audio() 函数。

function myFunction() {
  var beep = Audio('beep.mp3');
  beep.play();
  alert("Hello! I am an alert box!");
}

參考文獻：https://developer.mozilla.org/en-US/docs/Web/API/HTMLAudioElement

Answer

您可以尝试使用 Audio() 函数。

function myFunction() {
  var beep = Audio('beep.mp3');
  beep.play();
  alert("Hello! I am an alert box!");
}

參考文獻：https://developer.mozilla.org/en-US/docs/Web/API/HTMLAudioElement

Question 2

我最终编写并加载了我自己的 Chrome 扩展程序，它将 Javascript 代码注入到目标页面中，并覆盖 alert() 方法：

清单.json

{
    "name": "Alert-Beep",
    "manifest_version": 2,
    "version": "0.1",
    "description": "Beeps if alert() is called",
    "content_scripts": [
        {
            "matches": ["https://*/*", "http://*/*"],
            "js": ["alert-beep.js"]
        }
    ]
}

alert-beep.js

// based on https://stackoverflow.com/questions/51145353/intercept-request-and-modify-response
// sound from https://freesound.org/
// sound converted to base64 using https://dopiaza.org/tools/datauri/index.php
// testing at https://www.javascripttutorial.net/javascript-bom/javascript-alert/

const script = document.createElement('script');
//console.log("Started!");

script.innerHTML = `
const originalAlert = window.alert;

// billiard balls knock sound
var sound = new Audio("data:audio/wav;base64,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    //console.log("Override!");
    window.alert = (msg) => {
    sound.play();
        originalAlert("BZZT! "+msg);
    };
`;

document.documentElement.appendChild(script);

Answer

我最终编写并加载了我自己的 Chrome 扩展程序，它将 Javascript 代码注入到目标页面中，并覆盖 alert() 方法：

清单.json

{
    "name": "Alert-Beep",
    "manifest_version": 2,
    "version": "0.1",
    "description": "Beeps if alert() is called",
    "content_scripts": [
        {
            "matches": ["https://*/*", "http://*/*"],
            "js": ["alert-beep.js"]
        }
    ]
}

alert-beep.js

// based on https://stackoverflow.com/questions/51145353/intercept-request-and-modify-response
// sound from https://freesound.org/
// sound converted to base64 using https://dopiaza.org/tools/datauri/index.php
// testing at https://www.javascripttutorial.net/javascript-bom/javascript-alert/

const script = document.createElement('script');
//console.log("Started!");

script.innerHTML = `
const originalAlert = window.alert;

// billiard balls knock sound
var sound = new Audio("data:audio/wav;base64,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    //console.log("Override!");
    window.alert = (msg) => {
    sound.play();
        originalAlert("BZZT! "+msg);
    };
`;

document.documentElement.appendChild(script);

当浏览器警告弹出时是否可以播放声音？

答案1

答案2

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