<!doctype html>
<meta charset= "Utf-8" >
<title> Untitled Document </title>
<script type= "Text/javascript" >
function Test1 () {
Window.alert ("You clicked Button");
}
function Test2 () {
Define two variables and assign a value
var num1=2;
var num2=3;
var res=num1+num2;
Window.alert ("num1+num2=" +res);
}
function Test3 () {
var name= "Hello";
Window.alert (the type of name is: "+typeof name");
}
function Test4 () {
var a= "Hello";
var a= "World";
Window.alert (A + "--" +a);
}
function Test5 () {
var n1=0x8a;
var n2=0010123;
var n3=1234;
Alert (n2);
}
function Test6 () {
var s= "abc";
The parseint () function is a global function of JS and can be used directly
Where to find
Alert (parseint (s));
var r=7/0;
Alert (R);
}
function Test7 () {
Window.alert ("False, 0," ", null, Undefined, Nan these represent false");
var a=10;
if (a) {alert ("true")}
Else{alert ("false")}
}
function Test8 () {
Window.alert ("Hello,china");
}
function Test9 () {
var num1=window.prompt ("Please enter the first number:");
var num2=window.prompt ("Please enter a second number:");
var res=parsefloat (NUM1) +parsefloat (num2);
Window.alert ("The result is:" +res);
}
function A () {
Window.alert ("+ 、-、 *,/,%");
}
Function B () {
var jia=2+3;
var jian=3-2;
var cheng=2*3;
var Chu=6/3;
Window.alert (jia+ "--" +jian+ "--" +cheng+ "--" +chu ");
}
</script>
<body>
JS Starter Program <br/>
<input type= "button" value= "Hello,world" onclick= "Test1 ()" >
JS Variables and Operations <br/>
<input type= "button" value= "JS Variable and operation" onclick= "Test2 ()" >
JS variable type is determined by the JS engine, if you want to see the type of a variable, you can use the TypeOf operator <br/>
<input type= "button" value= "JS variable type" onclick= "Test3 ()" >
Variable usage Precautions:<br/>
1. Variable Case sensitivity <br/>
<input type= "button" value= "Note 1" onclick= "test4 ()" >
JS data types are <br/>
Basic data type [1. Integer 2. Real number 3. BOOL 4. String]<br/>
Composite data type [1. Array 2. Object]<br/>
Special data type [1. Null 2. undefined]<br/>
<input type= "button" value= "integer" onclick= "Test5 ()" >
<input type= "button" value= "real" onclick= "Test6 ()" >
<input type= "button" Value= "boolean" onclick= "Test7 ()" >
<input type= "button" value= "character" onclick= "Test8 ()" >
JS Data type Conversion <br/>
<input type= "button" value= "JS Calculator" onclick= "Test9 ()" >
JS Operators <br/>
<input type= "button" value= "JS operator" onclick= "A ()" >
<input type= "button" value= "Operation Case" onclick= "B ()" >
JS bit arithmetic, logic operation <br/>
<a href= "http://blog.csdn.net/dzy21/article/details/46986193" > Reference articles </a>
</body>
Operation Result:
These are only the knowledge that must be mastered, to broaden their horizons to see more JS documents can be, the latter will continue to update.
Copyright Notice: Bo Master original articles, reproduced please indicate the source. Http://blog.csdn.net/dzy21
JavaScript basic data types and operations
