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This article introduces the relevant knowledge of "how to define variables in vue". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

The specific methods are as follows:

1. Using var to define variables

var a = 1;

console.log ('function outside var definition a:' + a);

function change(){

a = 4;

console.log ('var defines a:' + a);

}

change();

console.log ('var after function call defines a as function internal modification value: ' + a);

Note: When using var to define variables, variables can be modified. When variables are not initialized, undefined will be output, but no error will be reported.

2. Using const to define variables

const b = 1;

const b;

console.log ('function outside const definition b:'+ b);

//console.log ('modify const definition outside function b:' + b);

Note: When using const to define variables, variables cannot be modified, and variables must enter initialization, otherwise they cannot be output.

3. Defining variables with let

let c = 3;

console.log ('function outer let definition c:'+ c);

funcion change(){

let c = 6;

console.log ('let defines c: ' + c);

}

change();

console.log(c);

Note: You can use let to define variables inside a function, with no effect outside the function.

The content of "how to define variables in vue" is introduced here. Thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!

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