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The string
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alert(0.02 / 0.1);  //0.19999999999999998 
  
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[·­Òë]High Performance JavaScript(010)

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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