html2canvas截圖白邊顯示問題

html2canvas(document.getElementById('resource_chart'),{
    useCORS:true,
    logging:false,
    width:$('#resource_chart').width(),//設置canvas尺寸與所截圖尺寸相同，防止白邊
    height:$('#resource_chart').height(),//防止白邊
}).then(function (canvas) {