Scripting languages such as JS and PHP define the scope of variables within a for loop and if statement

In scripting languages such as JS and PHP, the defined variables in the For loop will first refer to the For loop outside of Var L, (only once L is defined), so outside of the for loop can output L<...script>var a=0;if (a==0) {var i=1;} alert (i); for (Var j=0;j<5;j++) {}alert (J), for (Var k=0;k<5;k++) {var l=3;} Alert (l); in languages such as C # for (int i=0;i<5;i++) {string a= "abc";} There will be 5 string a at compile time;

Scripting languages such as JS and PHP define the scope of variables within a for loop and if statement