javascript pocket reference

a copy of Num. Copy of similar operating systemvar num=10;var num2=num;num2=100; //Does not affect the value of NumConsole.log ("num=%d num2=%d", num,num2);Results2. Reference type, copy reference addressvar person1=new Object ();person1.age=18;var Person2=person1; //Copy the reference address, person2 the variable, and point to an objectperson2.age=30; //is act

This article mainly introduces the reference and assignment of JavaScript objects, and analyzes the operation skills and precautions for reference and assignment of JavaScript objects in the form of examples, for more information about JavaScript Object

How do I refer to a variable in PHP in JavaScript? For example: In PHP already has a variable $filename value of "1.txt", the user click the Delete button to pop up the JavaScript confirmation dialog box, the content is "delete 1.txt". How do I reference the value of $filename? (Beginner, problem may be some idiot, please answer patiently, thank you) Reply co

This afternoon, thinking about calling the function, what about the arguments passed to the executing function. When the type of the value is different, there is no change.When the value of the parameter is the basic type, this time is passed by value, this is definitely clear, but the time is the reference type, this time what is the situation ah.　　　　When we pass an object as an argument, we find out how to run the Funx function, but the global objec

then accesses o when name is modified to B. The reference to O here points to the new object B;Look at the following example and everyone will understand.function Quotefn (obj) { varnew Object (); = o; = "Tony"; =; = "Men";} var person = { "miracle", }console.log (person.name); console.log (person.age); Console.log (person.sex);In this example, you first create the person object and set its name attribute value to "miracle",

variable, the old and new variables are not related; The reference type also duplicates the new variable, but the variable is a pointer to the same object as the old two pointers 3. Parameter Pass of function: all the parameter transfer principle is to pass the external variable to the function's parameter by the way of copying. Therefore, the operation of the parameter inside the function has no effect on the external original variable The follow

ask whether you want an apple or a pear. And if you don't want watermelon, then the big ye will take out a pear again, ask you to want? That's the truth. Grouping of regular expressions: We can group regular expressions by using parentheses. The so-called grouping, in fact, can be understood as a partner, and there is no commercial interests, the relationship between partners is a proud, a loss. That is to say, the things in parentheses as a group, a unit. Grouping is the subexpression in the

Reference Aaron's JavaScript definition object writing (Arrangement) Several simple methods for defining objects in Javascript 1. constructor method. All attributes and object methods are defined in constructor. Advantage: Dynamic Transmission Parameters Disadvantage: each time an object is created, the same method and function object will be created, occup

to lowercase. ToString ()Returns the original string value. toUpperCase ()Returns a copy of the specified string in which all characters have been converted to uppercase. Trim ()Returns a copy of the specified string, with both front and back whitespace characters removed. ValueOf ()Returns the original string value. Static methodsString.fromCharCode ()Creates a new string using the character encoding passed in as a parameter. HTML methodSince these are not s

The example in this article describes the use of JavaScript reference assignment (address-passing value). Share to everyone for your reference. Specifically as follows: JavaScript by default, arrays, objects, and functions are reference assignments, as shown in the followin

A reference type is a data structure that is essentially a collection of information and functions. Reference types are also sometimes referred to as object definitions because they describe the properties and methods that a class of objects have. The reference type is equivalent to the class in Java, although JavaScript