javascript - How to set crop box in jquery cropper -

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i'm using cropper, it's jquery plugin found @ cropper web site.
have image size full hd 1920w on 1080h, , need give user ability crop in fixed box size 675*1080, question how set options of plugin ?
i've tried follow no success: 

var c1 = $('.cropper-example-1 img').cropper({             //aspectratio: 10 / 16,             strict: true,             background:false,             guides: false,             highlight: false,             dragcrop: false,             movable: false,             resizable: false,             mousewheelzoom: false,             touchdragzomm:false,             built: function () {                 //alert(1);                // $(this).cropper('setdata', 0, 0, 675, 1080,90);                // $(this).cropper('setcropboxdata', 0, 0, 1920, 1080);             }         });

try add autocroparea: 0.5, , changes built method

var $image=$('.cropper-example-1 img');  $image.cropper({             //aspectratio: 10 / 16,             strict: true,             background:false,             guides: false,             highlight: false,             dragcrop: false,             movable: false,             resizable: false,             mousewheelzoom: false,             touchdragzomm:false,              autocroparea: 0.5,             built: function () {                 //alert(1);                // $(this).cropper('setdata', 0, 0, 675, 1080,90);                // $(this).cropper('setcropboxdata', 0, 0, 1920, 1080);                 $image.cropper('setcanvasdata', 0, 0, 1920, 1080));                 $image.cropper('setcropboxdata', 0, 0, 675, 1080);              }         });

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