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[·­Òë]High Performance JavaScript(007)

Dynamic Scopes  ¶¯Ì¬×÷ÓÃÓò
    Both the with statement and the catch clause of a try-catch statement, as well as a function containing eval_r(), are all considered to be dynamic scopes. A dynamic scope is one that exists only through execution of code and therefore cannot be det ......

[·­Òë]High Performance JavaScript(008)

Nested Members  ǶÌ׳ÉÔ±
    Since object members may contain other members, it's not uncommon to see patterns such as window.location.href in JavaScript code. These nested members cause the JavaScript engine to go through the object member resolution process each time a dot is ......

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