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我正在开发一个简单的应用程序,在此我试图访问相机和麦克风使用getUserMedia.它适用于桌面Chrome和Android Chrome,但在iPhone和iPad Chrome中无效.

navigator.getUserMedia = navigator.getUserMedia
        || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
var constraints = "";
if (mediaType === "audio,video") {
    constraints = {
        audio : true,
        video : true
    };
} else {
    constraints = {
        audio : true,
        video : false
    };
}
navigator.getUserMedia(constraints, successCallback, errorCallback);