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replace

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var str="A=B+C";
alert(((str.replace('A','ABC')).replace('B','BCA')).replace('C','CBA'));
½á¹ûÊÇABCBA=B+C
ÎÒÏëÒªµÄ½á¹ûÊÇABC=BCA+CBA
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var str="A=B+C";
alert(str.replace("C","CBA").replace("B","BCA").replace("A","ABC"))
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str = str.replace(/A|B|C/g, function($0) {
    return {
        "A": "ABC"
        , "B": "BCA"
        , "C": "CBA"
    }[$0];
});
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