Should I use window.variable or var?

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A potentially important difference in functionality is that window.myGrid can be deleted, and var myGrid can not.

var test1 = 'value';
window.test2 = 'value';


console.log( delete window.test1 ); // false ( was not deleted )
console.log( delete window.test2 ); // true  ( was deleted )


console.log( test1 );  // 'value'         ( still accessible )
console.log( test2 );  // ReferenceError  ( no longer exists )

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