The difference between local variable var and non-VAR in JavaScript global variables

One, the external is global, the internal is a local variable.

Two, plus Var is a local variable (within the method), without var as a global variable (once used within the method)

var golbe= "global"function  Test () {      var local= "local";     document.write (golbe);     document.write (local); }document.write (Golbe); document.write (local); </script>

In the above test method, when the Var of the local variable is removed, local becomes the global variable, but local is not used locally, then this local is not valid as a global.

To verify this, I commented out the only code inside the test method that uses the local variable. The discovery does not print out on the outside.

The difference between local variable var and non-VAR in JavaScript global variables