for(var i=0;i<3;i++){ alert("Hello,"+arr[i]); }
var i=0; while(i<3){ alert("Hello,"+arr[i]); i++;}
for(var i=2;i>=0;i--){ alert("Hello,"+arr[i]); }
var i=2; while(i>=0){ alert("Hello,"+arr[i]); i--;}
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孤独的橡树木头
for(var i=0;i<3;i++){ alert("Hello,"+arr[i]); }
var i=0; while(i<3){ alert("Hello,"+arr[i]); i++;}
for(var i=2;i>=0;i--){ alert("Hello,"+arr[i]); }
var i=2; while(i>=0){ alert("Hello,"+arr[i]); i--;}