https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var-to-declare-a-variable-in-jav 答案1 The difference is scoping. var is scoped to the nearest function block and let is scoped to the nearest enclosing block, which…

原文链接:A re-introduction to JavaScript (JS tutorial) Why a re-introduction? Because JavaScript is notorious for being the world's most misunderstood programming language. It is often derided as being a toy, but beneath its layer of deceptive simplicity…

JavaScript var, let, const difference All In One js var, let, const 区别 All In One 是否存在 hoisting var 存在 hoisting; let, const 不存在 hoisting; let, const 存在 TDZ 暂时死区,在定义之前,不可以访问 const log = console.log; log(`i =`, i); // Uncaught ReferenceError: i is not…

文章来自:http://www.aintnot.com/2016/02/12/phps-source-code-for-php-developers-part3-variables-ch 原文:http://blog.ircmaxell.com/2012/03/phps-source-code-for-php-developers_21.html 在"给PHP开发者的PHP源码"系列的第三篇文章,我们打算扩展上一篇文章来帮助理解PHP内部是怎么工作的.在第一篇文章,我们介绍了如何查看P…

variable point to code variable expression tree data structure lamda expression anonymous function 原文 Newcomers to LINQ often find expression trees difficult to grasp. In this post I hope to show that the subject is not quite as difficult as it might…

1. Introduction Groovy supports multiple ways to generate text dynamically including GStrings, printf and MarkupBuilder just to name a few. In addition to these, there is a dedicated template framework which is well-suited to applications where the t…

<script> function isleapyear(year) { if(parseInt(year)%4==0 && parseInt(year)%100!=0)return true; if(parseInt(year)%400==0)return true; return false; } function datedrift(date,difference) { if(date.constructor!==Date)return Date(); var year=…

CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. The golden rule…

转自:http://blog.leapoahead.com/2015/09/15/js-closure/ 我研究JavaScript闭包(closure)已经有一段时间了.我之前只是学会了如何使用它们,而没有透彻地了解它们具体是如何运作的.那么,究竟什么是闭包? Wikipedia 给出的解释并没有太大的帮助.闭包是什么时候被创建的,什么时候被销毁的?具体的实现又是怎么样的? "use strict"; var myClosure = (function outerFunction()…

SAS Annotated Output GLM   在使用SAS过程中,proc glm步输出离差平方和有4种算法,分别是SS1 SS2 SS3 SS4 下面文章介绍了其中SS3的具体计算步骤和例子. This page shows an example of analysis of variance run through a general linear model (glm) with footnotes explaining the output. The data were coll…