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WindowObject
The window object represents the current browser window.
It is also the "global" object in JavaScript. As such, any global variable that you define is accessible as a property of the window object. This can avoid unnecessary use of eval() to retrieve a global object/function for which the name is only available in the form a string. E.g. <script type="text/javascript">
var myVariable = 23;
function aFunction(paramA) {
alert(myVariable); // 23
alert(window.myVariable); // 23
alert(window['myVariable']; // 23
if (typeof paramA === 'string') {
alert(window[paramA]); // 23 if paramA is 'myVariable'
}
alert(eval('myVariable')); // 23, but much slower because the compiler has to kick in.
if (typeof paramA === 'string') {
alert(eval(paramA)); // 23 if paramA is 'myVariable' but again slower, and poses security risk.
}
}
</script>Properties
Methods
Further reading |
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