Canvas not supported
Play
Increase speed
Decrease speed
// Create a couple of global variables to use.
var audioElm = document.getElementById("audio1"); // Audio element
var ratedisplay = document.getElementById("rate"); // Rate display area
// Hook the ratechange event and display the current playbackRate after each change
audioElm.addEventListener("ratechange", function () {
ratedisplay.innerHTML = "Rate: " + audioElm.playbackRate;
}, false);
// Alternates between play and pause based on the value of the paused property
function togglePlay() {
if (document.getElementById("audio1")) {
if (audioElm.paused == true) {
playAudio(audioElm); // if player is paused, then play the file
} else {
pauseAudio(audioElm); // if player is playing, then pause
}
}
}
function playAudio(audioElm) {
document.getElementById("playbutton").innerHTML = "Pause"; // Set button text == Pause
// Get file from text box and assign it to the source of the audio element
audioElm.src = document.getElementById(‘audioFile‘).value;
audioElm.play();
}
function pauseAudio(audioElm) {
document.getElementById("playbutton").innerHTML = "play"; // Set button text == Play
audioElm.pause();
}
// Increment playbackRate by 1
function increaseSpeed() {
audioElm.playbackRate += 1;
}
// Cut playback rate in half
function decreaseSpeed() {
if (audioElm.playbackRate <= 1) {
var temp = audioElm.playbackRate;
audioElm.playbackRate = (temp / 2);
} else {
audioElm.playbackRate -= 1;
}
}
原文：http://blog.csdn.net/bonlog/article/details/
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