javascriptの関数のデフォルト値
function resetCanvas(canvas,jsonData=null) {
function resetCanvas(canvas,jsonData) {
var j = (j !== undefined) ? j : null;
アロー関数
resetCanvas = (canvas) => {
resetCanvas =function(canvas) {
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javascriptの関数のデフォルト値
function resetCanvas(canvas,jsonData=null) {
function resetCanvas(canvas,jsonData) {
var j = (j !== undefined) ? j : null;
アロー関数
resetCanvas = (canvas) => {
resetCanvas =function(canvas) {
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