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has been a bit confused on the scope of JS, today by chance to read JavaScript authoritative guide, immediately be attracted to, write really good. I look at the sixth version, quite thick, about 1000 pages, JS Broad and profound, to be familiar with the need to master the great perseverance of Kung Fu.One: function scopeLet's look at a short piece of code:[JavaScript]View Plaincopy var scope="glob

The scope of JS has been a bit confused, and today I accidentally read the JavaScript Authority Guide, was immediately attracted to write really good. I am looking at the sixth version, quite thick, probably more than 1000 pages, JS Broad and profound, to be familiar with the need to master the great perseverance great effort. One: function scopes First look at a small piece of code: var scope= "global"; fu

In AngularJS, you sometimes need to monitor a variable in Scope, because the variable changes will affect the display of some interface elements, next, we will use this article to introduce AngularJS to monitor Scope variables and call Scope Methods externally. For more information, see AngularJS. Sometimes you need to monitor a variable in

In Angularjs, it is sometimes necessary to monitor a variable in scope because changes in variables affect the display of some interface elements. Sometimes, you also want to invoke a method of scope through jquery. For example, the following scenario: Above, we hope: Jqbtnstate variable value in scope if False let the button with ID jqbtn disable

To understand the scope of a variable, you must first understand the scope chain.When a variable is declared with the var keyword, an attribute is added to the object where the variable is located.Scope chain: Because js variables are all attributes of objects, this object may be attributes of other objects, and all objects are properties of window objects, therefore, the relationship between these objects

First, function scopeYou can add wrapper functions outside of your code to hide internal variables and function definitions.var a = 2; function foo () { //; Console.log (a); 3} //Console.log (a);//2 This technique must declare a named function foo (), and Foo itself "pollutes" the scope. Second, you must explicitly call this function through the function name (foo ()) to run the code in it.var a = 2;(function foo () { //; Console.log (a);

1 Scope ( global scope)objects that can be accessed anywhere in your code have global scope, and in general there are several scenarios where you have global scope:(1) The outermost function and the variables defined outside the outermost function have global scope. (2) All

" }) (); // pscope3.innerhtml + = i;//Error } Anonymous ();1, anonymous function can be used to imitate the block-level scope, to avoid the above problem.2. A private scope is inserted outside the For loop. Any variables defined in an anonymous function will be destroyed at the end of execution.3. If the above sentence is commented out, uncomment it and the error messag

Javascript scope and JS Scope After reading this article, I found that the more basic things are displayed, the more advanced they are.Reference: http://realazy.org/blog/2007/07/18/scope-in-javascript/Scope is one of the cornerstones of the Javascript language. It may also be the most headache for me when building comp

JS Scope and scope chainhttp://blog.csdn.net/yueguanghaidao/article/details/9568071One: function scopeThe first sentence output is: "Undefined", not "global"The second output is: "Local"You might think that the first sentence will output: "Global" because the code has not executed var scope= "local", so it will definitely output "global".I said the idea was absol

I. Description of scopeThere is an incisive description of scopes in the JavaScript authoritative guide: "The functions in JavaScript run in their defined scopes, not in the scopes they are executed in." ”In JavaScript, the concept of scopes is almost the same as in other languages, and each time a function is called, it enters a scope within a function, and when returned from the function, returns the scope