JS native objects, built-in objects, and host objects

This post was finally edited by the non-solution, on 2012-9-9 12:13 <ignore_js_op> This figure comes from the P184 page of the third chapter of the JavaScript Language essence and programming practice. Recently in the second edition, this picture has been re-done, need to be able to see the comparison. In addition, the concept used in the supplement one: 1. The difference between the built-in (build-in) object and the native (Naitve) object is that the former object is always created at the engine initialization stage and is a subset of the latter, while the latter includes some objects that are created dynamically during the run. 2, the engine extension object is a not too large collection, generally more determined, they also belong to the engine's native object (but not the ECMA specification of the native object). 3. The host object is not the original object of the engine, but is registered by the host framework with some mechanism in the JavaScript engine. 4, some hosts will provide themselves with the object/constructor also known as the "native object", for example, Internet Explorer 7 to the XMLHttpRequest it provides () is known as the original-in contrast to its earlier version of the "new ActiveXObject (' Microsoft.XMLHTTP ') the object created by this method. In this case, the reader should note the difference between the "native object of the host" and the "native object of the engine".

JS native objects, built-in objects, and host objects (GO)