Things you need to pay attention to and some basic syntax when using JavaScript_Basic knowledge

1. Javacsript implements hyperlinks: <a href="javascript ('Hello')>Dandian</a>

2. Function calls in JavaScript can precede function declarations.
3. JavaScript does not require all paths to have a return value like in C#. If there is no return value, it returns undefined
Anonymous function:

Copy code The code is as follows:

var f1=function(i1,i2){return i1 i2};
Alert(f1(10,12));
Alert(function( i1,i2){return i1 i2}(10,12));

4. There is no concept of namespace in Javascript. Functions with the same name in two js files are quoted as last or last The declared function shall prevail.
When referencing external js files: it cannot be <script src="…" type=" text/javascript" />, it must be written as: <script src="…" type="text /javascript" ></script>

5. There is no class syntax in Javascript, which is simulated with function closures.

6. Arrays in JS are not just ordinary Arrays can also be used as Dictionary and Stack. 🎜>var array=new Array();
array["人"]="ren";
array["口"]="kou";

array["hand"]="shou "