我用调用拍照，每次都会进入摄像头占用的方法怎么解决

mui("body").on("tap","#paizhao",function(){   

            var zhaoxiang = plus.camera.getCamera();  
            var res = zhaoxiang.supportedImageResolutions[0];  
            var fmt = zhaoxiang.supportedImageFormats[0];  
            zhaoxiang.captureImage( function(path){  

                plus.io.resolveLocalFileSystemURL(path, function ( entry ){  
                var localurl = entry.toLocalURL(path);  
                $("#xianshi").attr("src",localurl);  

                });  
                },  
                function(error) {  
                    alert( "Capture image failed: " + error.message );  
                },  
                {     
                    resolution:res,  
                    format:fmt  
                }  
            );  
        });  
'''  

为什么每次都会跳到error里面去呢  

每次打开摄像头都跳一下