0 mean true or false

In JavaScript && arithmetic and | | Operations are used very often, but in some cases do you really understand what they mean?For example: Today's analysis of the JQ AddClass method appears when this sentencetypeof Value = = = "string" && valueJust

Original: What does the settimeout (fn,0) under JavaScript mean?I'm very sensitive to settimeout and stuff like that in the recent study of asynchronous programming. On the segmentfault saw a problem "about settimeout time set to 0 o'clock": the

Unsupervised learningUnlike supervised learning, data is not labeled (categorized) in unsupervised learning. Unsupervised learning requires algorithms to find the inherent laws of these data and classify them. (as in the data, and there is no label,

What does PHP mean! $ Status & amp; $ status $ pm [msgtoid] & amp; $ pm [new]; what does the PHP statement mean? ------ solution --------------------! $ Status & amp; $ status $ pm [msgtoid] & amp; what does the PHP statement mean? ! $ Status & $

What does PHP mean! $ Status & amp; $ status = $ pm ['msgtoid'] & amp; $ pm ['new']; what does PHP mean ,! $ Status & amp; $ status What does PHP mean? ! $ Status & $ status = $ pm ['msgtoid'] & $ pm ['new']; What does PHP mean? ------ Solution ---

What is the true idea of object-oriented programming?The real idea of object-oriented programming is to forget everything about computers and consider problems in the field of problems,From question?My understanding:1. Abstract The analysis process:

To better understand css, especially css rendering in IE, haslayout is a concept that needs to be completely cleared. Most IE display errors are due to haslayout. What is haslayout? Haslayout is an internal component of the Windows Internet Explorer

Int? : Represents a nullable type, which is a special value type whose value can be nullFor assigning variables (int type) to NULL, instead of 0, when setting the initial value of the variableInt?? : Used to judge and assign a value, first determine

MySQL Overview: MySQL is a relational database management system, the so-called Association database is to keep the data in different tables, rather than put all the data in a large warehouse. This increases speed and increases flexibility. and

The volatile modifier in Java is a special mechanism for ensuring the interaction between different threads. When One thread modifies a volatile variable, another thread can see the change. The first thread notifies the second thread that a variable