getContext 是HTML5 <canvas> 元素的一个方法,用于获取渲染上下文和它的绘图功能。如果 this.$refs.canvas 正确引用了canvas元素,那么它应该拥有 getContext 方法。这里不需要额外的代码来检查,因为这是 <canvas> 元素原生支持的方法。 3. 确保canvas元素在DOM中已渲染完毕 在Vue中,如果您在组件的...
https://zhidao.baidu.com/question/434893944652253124.html二、报错现象: Uncaught TypeError:this.canvas.getContextisnot a function atnewb (gauge.min.js:1) at HTMLDocument.<anonymous> (soc.js:22) at i (jquery.min.js:2) at Object.fireWith [asresolveWith] (jquery.min.js:2) at Function.ready...
rough.min.js:1 Uncaught TypeError: this.canvas.getContext is not a function at new t (rough.min.js:1) at Object.canvas (rough.min.js:1) at window.onload (index.html?_ijt=8kj4phaq3k33cqhrm3gobggm4f:25) Author lleohaocommentedMar 13, 2018 ...
写的方法不对啊,是getcontext(2d),并且没有大写 0 回复 相似问题this.$emit is not a function 2457 0 9 fileSystem.statSync is not a function 1552 1 4 TypeError: utf-8 is not a function 1280 0 3 疯狂报错Vue.extend is not a function 5923 0 2 index.js:16524 Uncaught TypeEr...
问无法在画布中使用canvas + vuejs (this.lowerCanvasEl.getContext不是一个函数)EN这不是Vue的问题。
Canvas绘制内容如何动态更新 组件是否支持泛型 自定义组件是否能通过容器保存 使用BuilderParam在父组件调用this的方法报错:Error message:is not callable Component如何监听应用前后台切换 自定义组件如何实现类似系统组件的链式调用 自定义组件在外部设置属性方法和在build方法内部设置有什么区别 如何实现页面加载...
const ctx = canvas.getContext('2d'); // 设置Canvas大小为窗口大小 canvas.width = window.innerWidth; canvas.height = window.innerHeight; // 玫瑰花类 class Rose { constructor() { this.reset(); this.size = Math.random() * 20 + 10; ...
functiondoSomeFontThings(evt){// We can either rely on scoped access to font, but because the onload function// is not guaranteed to live in the same scope, the font is in the event, too.constfont=evt.detail.font;// First, let's test some characters:[`a`,`→`,`嬉`].forEach(...
The case I presented is not a typical city hacking endeavor. The intervention was inspired by an official discourse promoted by the national television: In dark times, the citizens should get together and help turn their town around. While the initial motivation was to show the whole country th...