Javascript:javascript Style Wizard

Order
Most of the most appropriate methods for JavaScript are summarized.
Type
? Original type: We can use the value directly.
Οstring
Οnumber
Οboolean
Οnull
οundefined
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var foo = 1,
bar = foo;
bar = 9;
Console.log (foo, bar); => 1, 9
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? Compound Type: We access the value indirectly through ' reference '.
Οobject
Οarray
Οfunction
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var foo = [1, 2],
bar = foo;
Bar[0] = 9;
Console.log (Foo[0], bar[0]); => 9, 9
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Objects
? Creates an object using {}.
Bad
var item = new Object ();
Good
var item = {};
? Do not use reserved words as a keyword.
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Bad
var Superman = {
Class: ' Superhero ',
Default: {clark: ' Kent '},
Private:true
};
Good
var Superman = {
Klass: ' Superhero ',
Defaults: {clark: ' Kent '},
Hidden:true
};
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Arrays
? Create an array using []
Bad
var items = new Array ();
Good
var items = [];
? If you don't know the length of the array, use Array#push.
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var somestack = [];
Bad
Somestack[somestack.length] = ' Abracadabra ';
Good
Somestack.push (' Abracadabra ');
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? When you need to copy the array, use Array#slice.
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var len = items.length,
Itemscopy = [],
I
Bad
for (i = 0; i < len; i++) {
Itemscopy[i] = items[i];
}
Good
Itemscopy = Items.slice ();
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Strings
? For strings, we use single quotes '.
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Bad
var name = "Bob Parr";
Good
var name = ' Bob Parr ';
Bad
var fullName = "Bob" + this.lastname;
Good
var fullName = ' Bob ' + this.lastname;
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? A string of more than 80 characters, we use the concatenation symbol (\) to let the string display multiple lines.
? Note: Excessive use of characters with concatenated symbols can affect performance.
　
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Bad
var errormessage = ' This is a super long error ', ' is ' thrown because of Batman. When you are at stop to be about how Batman had anything to do with this and you are would get nowhere fast. '
Bad
var errormessage = ' This is a super long error '
was thrown because of Batman. \
When you stop to
How Batman had anything to do \
With this, your would get nowhere \
Fast. ';
Good
var errormessage = ' This is a super long error ' +
' was thrown because of Batman. ' +
' When you stop to the ' is about ' +
' How Batman had anything to do ' +
' With this ' and ' would get nowhere ' +
' Fast. ';
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? When we are programming, we need to splice a string, we can use Array#join instead of string connection. Especially for IE browsers.
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var items,
Messages
length, I;
Messages = [{
State: ' Success ', this article links http://www.cxybl.com/html/wyzz/JavaScript_Ajax/20130709/39005.html