concatメソッド

    var arry1 = ['ABC','DEF','GHI'];
    var arry2 = ['JKL','MNO'];

    //ABC,DEF,GHI
    document.write('配列1：' , arry1 , '<br />');

    //JKL,MNO
    document.write('配列2：' , arry2 , '<br />');

    //ABC,DEF,GHI,JKL,MNO
    document.write('配列1と配列2を連結：' , arry1.concat(arry2));