var info = [[1,'jack'],[0,'mary'],[3,'tom']];
$.each(info, function(i, j){
    $.each(j, function(m, n){
        document.write(n);
        if(m < j.length - 1){ 
            document.write("=>");
        }
    });
    document.write("<br/>");
});

//列印結果如下
1=>jack
0=>mary
3=>tom

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