Javascript 追加子项时出现HierarchyRequestError(this.context1.canvas1)
我正在尝试为我正在制作的游戏创建一个进度条。但是,当我尝试将画布连接到div时,出现了这个HierarchyRequestError。任何帮助都将不胜感激Javascript 追加子项时出现HierarchyRequestError(this.context1.canvas1),javascript,Javascript,我正在尝试为我正在制作的游戏创建一个进度条。但是,当我尝试将画布连接到div时,出现了这个HierarchyRequestError。任何帮助都将不胜感激 this.setSizePercent(horizontalSizePercent, verticalSizePercent); this.createCanvas(); this.createDOMElement(); return this; }) //原型 COREHTML5.RoundedRectangle.prototype={
this.setSizePercent(horizontalSizePercent, verticalSizePercent);
this.createCanvas();
this.createDOMElement();
return this;
})
//原型
COREHTML5.RoundedRectangle.prototype={
createCanvas: function () {
var canvas1 = document.createElement('canvas');
this.context1 = canvas1.getContext('2d');
return canvas1;
},
createDOMElement: function () {
this.domElement = document.createElement('div');
this.domElement.appendChild(this.context1.canvas1);
},
appendTo: function (element) {
element.appendChild(this.domElement);
this.domElement.style.width = element.offsetWidth + 'px';
this.domElement.style.height = element.offsetHeight + 'px';
this.resize(element.offsetWidth, element.offsetHeight);
},
resize: function (width, height) {
this.HORIZONTAL_MARGIN = (width - width *
this.horizontalSizePercent) / 2;
this.VERTICAL_MARGIN = (height - height *
this.verticalSizePercent) / 2;
this.cornerRadius = (this.context1.canvas1.height / 2 -
2 * this.VERTICAL_MARGIN) / 2;
this.top = this.VERTICAL_MARGIN;
this.left = this.HORIZONTAL_MARGIN;
this.right = this.left + width - 2 * this.HORIZONTAL_MARGIN;
this.bottom = this.top + height - 2 * this.VERTICAL_MARGIN;
检索canvas元素的2dcanvas上下文的属性被调用 因此,您应该使用
this.context1.canvas
而不是
this.context1.canvas1
检索canvas元素的2dcanvas上下文的属性被调用 因此,您应该使用
this.context1.canvas
而不是
this.context1.canvas1