splash：select()方法与select_all()

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select()

该方法可以选中符合条件的第一个节点，如果有多个节点符合条件，则只会返回一个，其参数是CSS选择器。示例如下：

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function main(splash) splash:go("https://www.baidu.com/") input = splash:select("#kw") input:send_text('Splash') splash:wait(3) return splash:png() end

这里我们首先访问了百度，然后选中了搜索框，随后调用了send_text()方法填写了文本，然后返回网页截图。

结果如图7-15所示，可以看到，我们成功填写了输入框。

select_all()

此方法可以选中所有符合条件的节点，其参数是CSS选择器。示例如下：

function main(splash)
local treat = require('treat')
assert(splash:go("http://quotes.toscrape.com/"))
assert(splash:wait(0.5))
local texts = splash:select_all('.quote .text')
local results = {}
for index, text in ipairs(texts) do
results[index] = text.node.innerHTML
end
return treat.as_array(results)
end

这里我们通过CSS选择器选中了节点的正文内容，随后遍历了所有节点，将其中的文本获取下来。

运行结果如下：

Splash Response: Array[10]
0: "“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”"
1: "“It is our choices, Harry, that show what we truly are, far more than our abilities.”"
2: “There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.”
3: "“The person, be it gentleman or lady, who has not pleasure in a good novel, must be intolerably stupid.”"
4: "“Imperfection is beauty, madness is genius and it's better to be absolutely ridiculous than absolutely boring.”"
5: "“Try not to become a man of success. Rather become a man of value.”"
6: "“It is better to be hated for what you are than to be loved for what you are not.”"
7: "“I have not failed. I've just found 10,000 ways that won't work.”"
8: "“A woman is like a tea bag; you never know how strong it is until it's in hot water.”"
9: "“A day without sunshine is like, you know, night.”"

可以发现，我们成功地将10个节点的正文内容获取了下来。