摘要:
```
$x("string-length(//h3[@class='t'])")
8 $x("string(//h3[@class='t'])")
"XPath 教程" $x("round(//h3[@class='t'])")
NaN $x("number(//h3[@class='t'])")
NaN $x("not(//h3[@class='t'])")
false $x("no 阅读全文
posted @ 2018-11-12 17:20
公众号python学习开发
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