JavaScript之遍歷數組

for遍歷 var arr = [1, 2, 3, 4]; for (var i = 0; i < arr.length; i++) { console.log(arr[i]); } forEach遍歷 var arr = [1, 2, 3, 4]; arr.forEach(function(val, index) { console.log(val, index); }); fo

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