什么是渴望加载?

本文介绍了什么是渴望加载?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

什么是渴望加载?我用PHP/JS编写代码，但是更通用的答案就可以了.

What is eager loading? I code in PHP/JS but a more generalised answer will be just fine.

我看到了很多有关Java和Java的问题. Ruby，但我不懂这些语言，而且我很难阅读代码.首先我不知道该怎么办

I saw a lot of questions regarding Java & Ruby, but i don't know any of these languages, and I find it hard to read code. I don't know whats supposed to do in the first place

推荐答案

共有三个级别:

急切加载:在询问时您可以完成所有操作.经典示例是将两个矩阵相乘.您进行所有计算.渴望加载；

延迟加载:仅在需要时进行计算.在前面的示例中，在访问结果矩阵的元素之前，您无需进行任何计算；和

急切加载:您可以在此处尝试预期用户的要求并对其进行预加载.

Eager loading: you do everything when asked. Classic example is when you multiply two matrices. You do all the calculations. That's eager loading;

Lazy loading: you only do a calculation when required. In the previous example, you don't do any calculations until you access an element of the result matrix; and

Over-eager loading: this is where you try and anticipate what the user will ask for and preload it.

我希望在您看到的情况下这是有道理的.

I hope that makes sense in the context you're seeing it.

让我给您一个"Webby"示例.

Let me give you a "Webby" example.

想象一下一个页面，其中包含用于菜单项或导航的过渡图像.在此页面上可以通过三种方式加载图像:

Imagine a page with rollover images like for menu items or navigation. There are three ways the image loading could work on this page:

加载呈现页面之前所需的每张图像(渴望)；

仅加载页面上显示的图像，并在需要时加载其他图像(惰性)；和

仅在页面加载时加载显示的图像.页面加载后，将其他图像预加载到后台(如果需要)(急切).

Load every single image required before you render the page (eager);

Load only the displayed images on page load and load the others if/when they are required (lazy); and

Load only the displayed images on page load. After the page has loaded preload the other images in the background in case you need them (over-eager).

有道理吗?