The global variables in JS

Variables declared with VAR are generally local variables.

function Test () {    var temp = "DSD"; #局部    Console.log (temp);} Test ()    /*DSD*/console.log (    temp)/* cannot output, variable is declaration */*uncaught referenceerror:temp is not defined* /

Variables declared in a function that do not use Var are global variables

function Test () {    = "DSD"; #全局    Console.log (temp);} Test ()    /*DSD*/console.log (     temp)/*DSD */

or use window to load the data into the current window, or you can implement a global

function Test () {    window[' temp ']= "DSD";    Console.log (window['temp');} Test ()    /*DSD*/console.log (window['Temp  ']/     *DSD* /

Nature: Variables declared above are not used by Var, which is equivalent to window. Variable or window[' variable ']

function Test () {v="Dsadas"Console.log (v)}test ()/*Dsadas*/Console.log (v)/*Dsadas*/Console.log (WINDOW.V)/*Dsadas*/Console.log (window['v'])/*Dsadas*/

The global variables in JS