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Jolly 正在处理画布元素并希望在画布中添加图像。确定以上选项中 Jolly 可用于实现所需任务的正确代码段。
A. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50); imageObj.src = 'picture1.jpg'; }; </SCRIPT>
B. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = new Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50);}; imageObj.src = 'picture1.jpg'; </SCRIPT>
C. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = new Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50); imageObj.src = 'picture1.jpg'; }; </SCRIPT>
D. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = Image(); imageObj.onload = function() { imageObj.src = 'picture1.jpg'; context.drawImage(imageObj, 69, 50); }; </SCRIPT>
2020年12月25日 08点12分
1
A. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50); imageObj.src = 'picture1.jpg'; }; </SCRIPT>
B. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = new Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50);}; imageObj.src = 'picture1.jpg'; </SCRIPT>
C. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = new Image(); imageObj.onload = function() { context.drawImage(imageObj, 69, 50); imageObj.src = 'picture1.jpg'; }; </SCRIPT>
D. <SCRIPT> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); varimageObj = Image(); imageObj.onload = function() { imageObj.src = 'picture1.jpg'; context.drawImage(imageObj, 69, 50); }; </SCRIPT>