正序:
for(var i in arr){
alert(`Hello,${arr[i]}!`);
}
for(var i=0;i<arr.length;i++){
alert(`Hello,${arr[i]}!`)
}
var i = 0;
var x = arr.length;
while(i<x){
alert(`Hello,${arr[i]}`);
i++;
}
倒序:
arr.reverse();
for(var i in arr){
alert(`Hello,${arr[i]}!`);
}
for(var i = arr.length-1;i>=0;i--){
alert(`Hello,${arr[i]}!`);
}
var i = arr.length-1;
var x = 0;
while(i>=x){
alert(`Hello,${arr[i]}`);
i--;
}
离家的圄