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如何获取音频文件的持续时间?

function handleFileSelect(evt) {
    evt.stopPropagation();
    evt.preventDefault();
    var files = evt.dataTransfer.files,

        dur = files.duration;

    document.getElementById('drop_zone-info').innerHTML = 'Duration: ' + dur + ' (h:m:s)';
}

测试:http: //jsfiddle.net/XSavU/1/

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