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Javascript scope

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There are two scopes in JavaScript: global and function. If you don\'t declare a variable (using var), it assumes global. \r\n\r\nVariables declared in functions have function scope.

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  1. var jj = 0;
  2. function testFunc2() {
  3.     jj = 42;
  4.     //Don't declare your variables like this.
  5.     //It is only an example to illustrate that variables declared anywhere in the function have function scope
  6.     var jj;
  7. }
  8.  
  9. testFunc2(); alert(jj);

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