javascript concatenate variables

Local variables:Variables declared within a function, function arguments are local variablesFunction nesting:Each function has its own scope, and local scope nesting occurs 　 1 var test = "Publice"; // global variable 2 function Fun1 () { 3 var test = "private1"; // 4 function Fun2 () { 5 var test = "privat E2 "; // 6 }; 7 }; View CodePriority level:In the function body, local variables are higher than global

If a variable is defined in a function, it is possible to access the variable every time the function is called, simply saying that the scope in the function body is useful. It is useless to go beyond this range.and global variables: If you define a variable outside of a function, then this variable is a global variable. And the variable can be accessed and modified within a continuous range. This is the global variable. If a variable is defined in a

A private variable: a property and method defined inside a function is called the function's private property and method common variables: Objects and methods created inside a function called this function are common properties and methodsPrivileged methods: a common property and method created through this can access both the function and the private properties and methods of the function called the privileged method Constructor: The object invokes

One, JavaScript scope is divided into function blocks, not as if, while, for. Second, JavaScript compiles the scope of a real variable by precompiling the entire script file (analyzing the declarative part of the script file, including the local variables section) before executing. For example, below: When the global variable has the

What do you think the result equals? is the output 1 2 1? Well, that's what I thought when I sent the test case to her, but after the test output ... The result of the operation is undefined 2 1. At that time, baffled, study + test, summarized as follows:The scope of a JavaScript variable is divided by the method block (that is, by a pair of curly braces {} of function). Remember, it is a function block, and for, while, if block is not the scope of th

The scope of a JavaScript variable is divided by the method block (that is, by a pair of curly braces {} of function). Remember, it is a function block, and for, while, if block is not the scope of the classification criteria, you can look at the following several examples:JavaScript performs a full analysis of the declaration portion of the entire script file (including local variables) before execution to

The difference between the two-segment JS code: "When a global variable has the same name as a local variable, the scope of the local variable overrides the scope of the global variable, and when it leaves the scope of the local variable, it returns to the scope of the global variable." So two pieces of code run the results are: 1) undefined World 2) Hello world.Then look at one of the following examples: What do you think the result equals? is the output 1 2 1? Well, that's what I thought wh

Transferred from: http://blog.csdn.net/zyz511919766/article/details/7276089Two-segment JS code:Example 1Example 2I think it's easy, isn't it the scope of global variables and local variables?I said, "When a global variable has the same name as a local variable, the scope of the local variable overrides the scope of the global variable, and when it leaves the scope of the local variable, it returns to the sc

JS in the function of the process is not just a simple local variable overrides global variables, and functions inside the declaration of the situation. Like what: JavaScript about local variables and global variables

For a programming language, it must contain variables and data types. Today we'll look at the variables and data types of the JavaScript scripting language. RelativeIn other high-level programming languages such as java,c++, JavaScript seems simple.A variableJavaScript variables