Bar我无法弄清楚为什么这个while循环不重复。使用的警报显示var i = 0;
while (i < collection.length) {
alert(i < collection.length); //true the first time... does not execute the second time
if (collection[i].hasOwnProperty(Object.keys(source))) {
alert(collection[i][Object.keys(source)]); //executes once
}
alert("out" + i); // out 0
i++;
alert("out2 " + i); //i is incremented correctly to 1
alert(collection.length + " " + i); // 3 1
alert(i < collection.length); //returns true but does not iterate again.
}
的增量，并且在第一次迭代结束时循环条件为真。这可能是一些小错误，但