添加回放SDP信息，兼容海康设备

Lawrence

2020-12-16 9c9ca9123a7508d174b8ea42683c0f2c64cb570b

 web_src/src/components/gb28181/devicePlayer.vue

@@ -306,7 +306,7 @@
        },
        close: function () {
            console.log('关闭视频');
            if (this.$refs.videoPlayer){
            if (!!this.$refs.videoPlayer){
              this.$refs.videoPlayer.pause();
            }
            this.videoUrl = '';