1、引入插件 2、点击事件,使用插件 3、缺点:导出后html中的本地文件可以显示,后台返回的图片链接无法显示 4、插件源码 https://unpkg.com/jspdf@latest/dist/jspdf.min.js html2canvas.js
So finally, you sit down one day and say, “Let’s do it!” Soon, you’re trying to figure out how to implement your app’s business logic, the killer feature that will drive the product forward: you have an idea of how to do it, and you know youcando it. “Done! It works!
The prototypal inheritance technique used by the language enables you to alter any prototype. Once an object is defined, you can change anything by adding or removing methods and performing other operations. The request and response model is the foundation of the entire web. Two-way data binding...
Modifying the global object can be used to implement various coding architectures or features, but abusing of this technique can be dangerous. On the other hand, if BigTest is instantiated using the new keyword, the this keyword will refer to the new object, rather than the global object. Mo...
Inheritance between roles can be achieved using theextendmethod, this allows a role to inherit allattributesdefined on another role. TheAccesscontrolpackage provides a plethora of features and if you want to dig deeper, there's an in-depth officialdocumentationavailable. ...
They allow you to augment the behavior of a function or class by wrapping it inside another function. For example, let’s assume that you want to have the same change handler on some of your components, but you don’t want to commit to the inheritance antipattern. You can use a class...
Discriminators are a schema inheritance mechanism. They enable you to have multiple models with overlapping schemas on top of the same underlying MongoDB collection. Suppose you wanted to track different types of events in a single collection. Every event will have a timestamp. ...
// Implement inheritance with the HigherLearning constructor var school = new HigherLearning (); school.schoolName = "MIT"; school.schoolAccredited = true; school.schoolLocation = "Massachusetts"; //Use of the for/in loop to access the properties in the school object ...
How to create a simple Next.js application on your computer 在本章中,将涉及以下主题: 什么是web应用程序? Next.js是什么?为什么它越来越受欢迎? 使用Next.js构建动态web应用程序的特点和好处 回顾JavaScript基础知识,包括数据类型、控制结构、函数和对象 高级JavaScript概念,如异步编程、承诺和ES6特性 如何使用Ne...
to encapsulate and distribute reusable functionality that can be shared across multiple components. A mixin is an object that contains component options like data, methods, computed properties, and lifecycle hooks. It allows you to extend the capabilities of components without the need for inheritance...