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function test(){
    if(arguments.length == 1)
        alert(arguments[0] + "£¬ÄãºÃ");
    else if(arguments.length == 2)
        alert(arguments[0] + "," + arguments[1] + "£¬ÄãÃǺÃ")
    else
        alert("´ó¼ÒºÃ");   
}
test();   //Êä³ö: ´ó¼ÒºÃ
test("a");  //Êä³ö: a£¬ÄãºÃ
test("a","b");  //Êä³ö: a,b,ÄãÃǺÃ
test("a","b","c","d");  //Êä³ö: ´ó¼ÒºÃ


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