[escape function]ActionScript1.2 vs ActionScript3 vs Javascript

ActionScript 1/2

var a:String = "香港:";
trace(escape(a)); // %E9%A6%99%E6%B8%AF%3A

ActionScript 3

var a:String = "香港:";
trace(escape(a)); // %u9999%u6E2F%3A
trace(encodeURI(a)); // %E9%A6%99%E6%B8%AF:
trace(encodeURIComponent(a)); // %E9%A6%99%E6%B8%AF%3A

JavaScript

var a = "香港:";
alert(escape(a)); // %u9999%u6E2F%3A
alert(encodeURI(a)); // %E9%A6%99%E6%B8%AF:
alert(encodeURIComponent(a)); // %E9%A6%99%E6%B8%AF%3A