补充SET 取值

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

s.forEach(function(item){
    document.write(item + '|');
})

// print: 1|2|3|

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

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

这个Set的应用场景是什么啊

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

不是廖雪峰不知道，是在这里讲这个不合适。这还涉及到教学内容顺序的安排