First, the subject:
1. Object creation:
(1) var obj = {};
(2) var obj= new Object(); obj.name="Wang",obj.age=12
(3) Object.create({});
2. Object Access:
(1) obj.a;
(2) obj [A]; // A may be the same string, and arrays;
3. Object methods:
(1) obj.hasOwnPrototype ( "prop" ); judging whether itself is a target, returns true; such as inherited attributes, to false;
(2) obj instanceof object; Example obj is absent Object constructor true / false;
Second, the array:
1. Array creation:
(1) was arr = [];
(2) var arr=new Array(1,2,3);
NOTE: var new new ARR = the Array (10); // 10 represents a length;
var arr = [10.2]; //10.2 denotes one;
2. Array method:
1. change the original array:
(1) .push (); was added to a final array.
(2) .pop (); delete the last digit array, not mass transfer parameters.
(3) .unshift (); was added to the top of the array.
(4) .shift (); delete array front.
(5) .reverse (); inverse array.
(6) .splice ( from several starts, how the interception length, inserted at the cut number ) ;
(7) .sort (); Sort
Notes: 1. The need to write two parameter;
2. See Return Value: . 1) return <0; A, B
2) return>0; b,a
3) return = 0; Fixed
Example:
.sort(function (a,b) {
return;
});
2. does not change the original array:
(1) .concat (); splicing array
(2) .slice ( from the intercept of the start, to the intercepting position)
(3) .toString();
(4) .join ( "") ; all values within the array is connected, is connected to the symbol marks;
(5) .split ( "") ; striped array or variable value, as a division sign quotation marks;
3. iterate: forEach ();
用法：array.forEach(function(currentValue, index, arr) { }, thisValue)
(1) currentValue: Required. The current element
(2) index: Optional. The current index value of the element.
(3) arr optional. The current array object element belongs.
(4) thisValue : Optional. Value passed to the function using the general "this" value ;
If it is NULL, "undefined" is passed to the "this" value ;
Note: You can not traverse the pseudo-array (array type);
4. iterate: Map ();
用法：array.forEach(function(currentValue, index, arr) { }, thisValue)
(1) currentValue: Required. The current element
(2) index: Optional. The current index value of the element.
(3) arr optional. The current array object element belongs.
(4) thisValue : Optional. Value passed to the function using the general "this" value ;
If it is NULL, "undefined" is passed to the "this" value ;
Note: You can not traverse the pseudo-array (array type);
The array-:
// property to be indexed (digital) properties;
// must have a length property, the best plus push;
var obj = {
"0":"a",
"1":"b",
"2":"c",
"length":3,
"push":Array.prototype.push,
"splice".Array.prototype.splice
}
Third, the identified array [] and objects {} :
(1) obj.constructor:
There are a = [];
var b = {};
a.constructor; //Array()
b.constructor; //Object()
(2) obj instanceof object:
There are a = [];
var b = {};
a instanceof Array; //true
b instanceof Array; //false
(3) Object.prototype.toString.call( [] ); //"[object Array]"
Object.prototype.toString.call( {} ); //"[object Object]"