webrtc web ios 创建RTCPeerConnection(iceServers, optionalArgument)时报不是构造函数,pc端正常

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webrtc 点对点连接时苹果端报，pc端连接时的时候是正常的
undefined is not a constructor (evaluating 'new RTCPeerConnection(iceServers, optionalArgument)')

var RTCPeerConnection = window.mozRTCPeerConnection || window.webkitRTCPeerConnection;

var optionalArgument = {
optional: [{
DtlsSrtpKeyAgreement: true
}]
};

var iceServers = {
"iceServers" : [
{
"url" : "turn:39.106.35.130:3478",
"username" : "name",
"credential" : "pass"
}
]
};
var peer = new RTCPeerConnection(iceServers, optionalArgument);