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var arrA = new Array(1,23,43,64,1,23,5,8,3,5,9);
var arrB = getNewArray(arrA);  // ¹ýÂ˺¯Êý
È»ºó¿ªÊ¼±àдº¯ÊýgetNewArray()
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function getNewArray(receiveArray) 
{
    var arrResult = new Array();  //¶¨ÒåÒ»¸ö·µ»Ø½á¹ûÊý×é.
    for (var i=0; i<receiveArray.length; i++)
    {
        if (/*ÔÚÕâÀï×öiÔªËØÓëËùÓÐÅжÏÏàͬÓë·ñ, µ÷Óú¯Êýcheck(arrResult, receiveArray[i]);*/)
        {
            arrResult.push(receiveArray[i]); // Ìí¼Ó¸ÃÔªËØµ½ÐÂÊý×é¡£Èç¹ûifÄÚÅжÏΪfalse£¨¼´ÒÑÌí¼Ó¹ý£©£¬Ôò²»Ìí¼Ó¡£
        }
    }
    return arrResult;
}
È»ºó±àдÅжϺ¯Êýcheck()
 Code
function check(receiveArray, checkItem)
{
    var index = -1;  // º¯Êý·µ»ØÖµÓÃÓÚ²¼¶ûÅжÏ
    for (var i=0; i<receiveArray.length; i++)  
    {
        if (receiveArray[i]==checkItem)  
        {
            index = i;
            break;
        }
    }
    return index;
}
ÔòÔÚº¯ÊýgetNewArray()ÖеÄifÓ¦¸Ãд³É:
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Javascript Closures

Javascript Closures
Introduction
The Resolution of Property Names on Objects
Assignment of Values
Reading of Values
Identifier Resolution, Execution Contexts and Scope Chains
The Execution Context
Scope chains and [[scope]]
Identifier Resolution
Closures
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