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什麼是 JavaScript? JS Basic JS Object
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Not Java. Interpreted language.Enhance the interaction between
web page and user.Free!
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HTML
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<html><head>
…information about web apge…
</head> <body>
…content of the web page…
</body> </html>
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Where to
Variable and data type
Logic
Popup box
Functions
Event
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in <body> demo
in <head> demo
in external files demo
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VariableData type
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var theName;
Case sensitiveBegin with a letter or the underscore
character
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Primitive Numbers Strings Boolean
composite datatype Function Object
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var theName; theName = 1900;
var myName = “Lemon Nineteen Hundred”;
var fullName = “Danny” + myName;
demo11
OperatorsComparisons if...elseswitchLoop
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+ - * / %demo
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== !=><>=<=
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if( condition ){
code to be executed if condition is true.}
demo
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if( condition ){
code to be executed if condition is true.}else{
code to be executed if condition is false.}
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if( condition A){
… code A …}else if( condition B){
… code B …}else{
… code C …}
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switch( variable ){
case A:… code A…
break;case B:
… code B … break;
default: … code C …}
demo18
When you need to do some thing again and again and again and…..
for loopwhile loop
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for(initial a counter ; condition ; increment a counter){
…code…}
demo
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while( condition ){
…code…}
demo
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Alert BoxConfirm BoxPrompt Box
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alert("text");demo
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Confirm(“text");
return true or false
demo
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prompt("text“ , "default value");
return the input value or null
demo
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A block of code for certain function reuseclearer JavaScript function list
demo
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function name( parameter1, parameter2,…){
…code block…
return value;}
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Movement can be detected by JavaScript
onclick onfocus onblur onmousemove
Event Attributes
demo28
BMI 計算器 BMI 算法：體重 (kg) / 身高 (m) 的平方
Hint : promt(“text”,”default text”);
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ArrayDateMath
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store multiple values in a single variable Properties
length Methods
concat() pop() push() shift() unshift() reverse() sort() splice()
demo
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Methods Set
setDate() setFullYear() setHours() setMinutes() setMonth() setSeconds()
Get demo
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Properties (Math constant) PI LN10 E
Methods abs(x) round(x) , ceil(x) , floor(x) max(x,y,z,...,n) , min(x,y,z,...,n) random()
demo
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樂透號碼產生器 規則 : 從 1~49 號中選 7 個數字 將選出來的數字排序後顯示在螢幕上
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http://www.w3schools.com/js/default.asp
JavaScript: The Definitive Guide 5th Edition - O'Reilly Media By David Flanagan
Learning Javascript 2nd Edition - O'Reilly Media By Shelley Powers
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