Home > Developer > JavaScript
1. Case sensitive
<script language= ' JavaScript ' >
var name= "Zhang";
var name= "ZHANG";
Document.writeln (name+ "<br/>");
document.write (name);
</script>
2. Weakly typed variables
All variables are marked with the VAR keyword, and the JavaScript interpreter automatically assigns
3. The end part of the sentence is optional
such as : Var name=23; or var name=23 can be
<script language= ' JavaScript ' >
var name= "Zhang"
var name= "ZHANG"
Document.writeln (name+ "<br/>")
document.write (name)
</script>
4. Code can be embedded in HTML or JS files can be introduced
<title>
Javascript
</title>
<script language= ' javascript ' >/* embedded in code, usually in head
var name= "Zhang"
var name= "ZHANG"
Document.writeln (name+ "<br/>")
document.write (name)
</script>
<body style= "Background-color: #dff" >
</body>
4.1 Code can be imported directly from another file
such as: <script src= "Javascript.js" ></script> results are the same
5. Multiple variables can be declared at the same time
such as: Var name= "Jerryzhang", age=23,sex= "male";
document.write (name+ "<br/>" +sex+ "<br/>" +age);
6. can not initialize
such as : var name;
document.write (name);
7 variable definitions cannot use keywords or reserved words (note: I do not know what to reserve words)
Such as: Html,title,history can be, but the document is not;
such as : var html= "asp.net";
document.write (HTML);
A variable in 8.JavaScript can store multiple types of variables
such as: Var i=23;
document.write (i+ "<br/>");
I= "Jerryzhang";
document.write (i+ "<br/>");
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
