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交作业，好像和大家的不一样，但是可以测试通过，而且简洁易懂

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余欢喜啦

#1 Created at ... [Delete] [Delete and Lock User] 
var parent = document.getElementById('test-delete');
var arr = parent.children;
for (var i = 0; i < arr.length; i++) {
    if (['JavaScript', 'HTML', 'CSS'].indexOf(arr[i].innerHTML) === -1) {
        parent.removeChild(arr[i]);
    }
}

余欢喜啦

#2 Created at ... [Delete] [Delete and Lock User]

对啦，因为我代码中那个 test-list id已经被占用了，所以改成了test-delete。

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