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Little bit of accumulation --- beginner Javascript, little bit --- javascript
On the way to learning knowledge, we need to constantly contact new knowledge. At the same time, we should not constantly summarize our old knowledge. Recently, I have a preliminary theoretical understanding of Javascript through "Niuke Javascript" and "special Javascript video" by Jiang Hao.
Introduction to Javascript LearningJavascript is a client scripting language that is based on objects and events and is relatively secure. Therefore, you need to have a certain object base when learning Javascript. Since you have learned C # and VB. NET, it is relatively easy to understand in the learning process.
At the same time, JavaScript is also a widely used scripting language for client Web development. It is often used to add dynamic functions to HTML (a subset of standard General Markup Language) webpages, such as responding to various user operations. So now we are learning Javascript For Web development.
In general, the complete JavaScript includes the following parts:
Its basic features are as follows:
JavaScript is often used to complete the following tasks:
When I was learning Javascript, I was always thinking that when I was learning VB, I started to explain the basic syntax and basic objects step by step; the difference may be that VB (without inheritance) is based on object-oriented Javascript (without polymorphism) it is fully object-oriented. The former is a compiled programming language, and the latter is an interpreted scripting language.
The following two figures show the differences between the two:
(Ps: summary chart when learning VB)
(PS: A Summary of Javascript. The basic object, BOM, and DOM are all objects in Javascript)
SummaryNo matter what we learn, we should contact the previous knowledge. In comparison, learning this requires us to be more impressed and understand the learned knowledge. At the same time, through comparative learning, we can find different points and similarities in different knowledge to build our knowledge network, which will be of greater help to our future studies. In this process, we will form a virtuous circle, which will shorten the cycle for us to learn new knowledge.
For... in can be used to traverse the attributes of an array or an object. The object friends has three attributes: "Hank", "bill", and "steve". Their values are all objects,... in can traverse the attributes of friends, but only get the attribute names, that is, "Hank", "bill", "steve ", if you want to access the values of these attributes, you can use the friends ["Hank"] method (the attribute name is used as the index to access the attribute value)
JavaScript beginners
<Html>
<Head>
<Title> function </title>
<SCRIPT merge Ge = "JavaScript">
Function car (seats, engine, radio)
{
This. seats = seats;
This. engine = engine;
This. radio = radio;
}
Var wcar = new car ("cloth", "V-6", "Tape ");
Var fcar = new car ("leather", "v-8", "cd ");
Var etype = wcar. engine;
Alert (etype)
Var stype = fcar. seats;
Alert (stype)
Var rtype = fcar. radio;
Alert (rtype)
</SCRIPT>
</Head>
<Body>
<SCRIPT merge Ge = "JavaScript">
Document. write (etype + "");
Document. write (stype + "");
Document. write (rtype + "");
</SCRIPT>
</Body>
</Html>
Change document. write = to document. write.
Change etypee to etype
Change var stype = fcar. setats;
Var stype = fcar. seats;
OK.
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