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var weights =[3,5,1,3,2,50 ];
for(var i=0;i<=weights.length;i++){
document.write(weights[i]);
}
var weights =[3,5,1,3,2,50 ];
var all_weight=0;
var avg_weight=0;
//数组的遍历
for(var i=0;i<=weights.length;i++){
all_weight +=weights[i];
}
avg_weight=all_weight / weights.length;
document.write("总重量是:"+all_weight+"平均重量:"+avg_weight);