const wordCloud = new WordCloud({ el: el.value }) wordCloud.run(words, () => {})计算文本的渲染位置 接下来到了核心部分,即如何计算出每个文本的渲染位置。 具体逻辑如下: 1.我们会维护一个map,key为像素点的坐标,value为true,代表这个像素点已经有内容了。
getNumbers; simpleGetNumbers(); // => undefined or throws an error in strict mode 通过bind 绑定后返回的 boundGetNumbers 函数中 this 指向了传入的 numbers,因此当执行的时候返回的是传入的数组。 如果是简单的将 numbers.getNumbers 抽离出来作为一个新函数 simpleGetNumbers ,此时属于「函数直接调用类型...
// bad // make() returns a new element // based on the passed in tag name // // @param <String> tag // @return <Element> element function make(tag) { // ...stuff... return element; } // good /** * make() returns a new element * based on the passed in tag name * *...
constis a new keyword in ES6 for declaring variables. const is more powerful than var. Once used, the variable can’t be reassigned. In other words, it’s an immutable variable except when it used with objects. 简单讲,就是Java中的 final,Kotlin中的 val。 This is really useful for target...
What went wrong? OurwhoAmI()call is in theglobalnamespace, sothisgets set towindow(or, in strict mode, toundefined),notto theobjinstance ofMyObjectFactory! In other words, the value ofthisnormally depends on the calling context. Arrow functions ((params) => {}instead offunction(params) {...
<!--In an html file-->console.log(this===window);// => true 1.2 函数直接调用中的 `this` 指向(严格模式) 严格模式下,函数直接调用中的this是undefined。 严格模式在ECMAScript 5.1 出现,对js一些语法进行了限制,可以提供一个更加安全、健壮的错误检查机制。 在函数体顶部加入'user strict'即可使用严格...
The require interface allows you to require the describe and friend words directly using require and call them whatever you want. This interface is also useful if you want to avoid global variables in your tests. Note: The require interface cannot be run via the node executable, and must be...
In simple and short words, it’s a boolean type but it’s not like true or false only. It’s more than that. Understanding them in theory is easy but sometimes leads to big troubles when these values are compared. So let’s demystify these values. Truthy Value JavaScript defines the ...
.sort('method')- re-arrange the order of the matches (in place) .reverse()- reverse the order of the matches, but not the words .normalize({})- clean-up the text in various ways .unique()- remove any duplicate matches Lib
Don't use reserved words as keys. It won't work in IE8. More info. // bad var superman = { class: 'superhero', default: { clark: 'kent' }, private: true }; // good var superman = { cssClass: 'superhero', defaults: { clark: 'kent' }, hidden: true }; Use readable syno...