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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 ......

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Cloning Nodes  ½Úµã¿Ë¡
    Another way of updating page contents using DOM methods is to clone existing DOM elements instead of creating new ones—in other words, using element.cloneNode() (where element is an existing node) instead of document.createElement().
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