[2015-12-10 profile] see a little every day [Javascript.dom Programming Art (2nd edition)]

13:23~14:30 the 2nd Chapter

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1. Data type

Variable name: Alpha-Numeric $ _ (first not allowed to be a number)

Underline separate each word

Function name: Hump format named Mymode

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2. Declaring variables that do not require a type declaration: weak type

var a = ' don\ ' t ask '

var a = "don ' t ask"

var a =-3.22222 (any decimal place)

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3. Arrays

var AA = Array (4);

var AA = Array ();

Aa[0] = "John";

var AA = Array ("RR", "true");

var AA = ["RR", (), true];

var aa =array ();

var bb = [];

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4. Objects

var Lennon = Object ();

Lennon.name = "John";

var lennon = {na me: "John", year:1940, living:false};

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5. Compare

var a =false;
var B = "";
if (a = = b) {
Alert ("A is B");
}else{
Alert ("a isnot B");
}

= = Comparison Value

= = = Comparison Value and type

! = Comparison Value

!== comparison values and types

Logic && | | !

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6. Cycle

var count = 1;
while (Count <=11) {
alert (count);
count++;
}

bo=
alert (count);
count++;
}while (COUNT<11);

for (var count =1;count<11;count++) {
alert (count);
}

var AA = ["Ruj", [+], false];
for (var count =0;count<aa.length;count++) {
alert (count);
}

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7. Functions

var----local variables in a function

No var----global variables

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var jeremy = new Person; Jeremy has the properties and methods of person

Built-in objects: Array Date math and so on

var current_date = new Date ();

var today = Current_date.getday ();

Host objects: predefined objects provided by the browser: Document FORM element, etc.

[2015-12-10 profile] see a little every day [Javascript.dom Programming Art (2nd edition)]