Comparing ActionScript and ECMAScript (JavaScript)

The following are some of the differences between ActionScript and JavaScript:

• ActionScript does not support browser-specific objects such as Document, Window, and Anchor.
• ActionScript does not completely support all of the JavaScript built-in objects.
• ActionScript supports syntax constructs that are not permitted in JavaScript (for example, the tellTarget and ifFrameLoaded actions and slash syntax) to support previous releases. However, Macromedia does not recommend the use of these syntax constructs; instead, use ActionScript elements that are like those in JavaScript (for example, with, _framesloaded, and dot syntax).
• ActionScript does not support some JavaScript syntax constructs, such as statement labels.
• In ActionScript, the eval action can only perform variable references.
• In JavaScript, when a string is evaluated in a Boolean context and the string has a nonzero length, the result is true; if the string doesn't have a nonzero length, the result is false. In ActionScript, the string is converted to a number. If the number is nonzero, the result is true; otherwise, the result is false.

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