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XPath 是一门在 XML 文档中查找信息的语言。XPath 可用来在 XML 文档中对元素和属性进行遍历。 在 XPath 中，有七种类型的节点：元素、属性、文本、命名空间、处理指令、注释以及文档节点（或称为根节点）。

###选取节点 节点是通过沿着路径或者 step 来选取的。

表达式：

nodename          选取此节点的所有子节点
/                 从根节点选取

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###安装pdfkit

pip install pdfkit
sudo apt-get install wkhtmltopdf

###安装pypdf

pip install pypdf

###生成pdf并添加水印

guangningyu

// 鼠标移入背景色变浓，移出变淡
$(document).ready(function() { // $(document)是一个封装好的函数，将DOM映射为一个jQuery对象
    $('div').mouseenter(function() {
        $('div').fadeTo('fast', 1);  // 0.25是透明度，1代表完全不透明
    }) ;   
    $('div').mouseleave(function() {
        $('div').fadeTo('fast', 0.5);
    }) ;   
});

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###Background Color

body {
    background-color: lightblue;
}

###Background Image

body {

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import sys
import qrcode

LINES_PER_PARA = 60

def split_file(infile):
    para_list = []
    para = []
    with open(infile, 'rb') as f:
        for line in f.readlines():

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// Java版本
import java.util.List;
import java.util.ArrayList;
public class NameCleaner {
     public static String cleanNames(List<String> listOfNames) {
         StringBuilder result = new StringBuilder();
         for(int i = 0; i < listOfNames.size(); i++) {
             if(listOfNames.get(i).length() > 1) {
                 result.append(capitalizeString(listOfNames.get(i))).append(",");
             }

guangningyu

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
This module is used to send emails in HTML format, with embedded attachments and images.
"""

__version__ = '0.2'
__date__ = '2016-04-25'
__author__ = 'Guangning Yu'

guangningyu

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
This module is used to run SQL code from remote DB host.
"""

__version__ = '0.2'
__date__ = '2016-04-13'
__author__ = 'Guangning Yu'

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
This module provides a few classes to easily generate HTML code
for tables, images and paragraphs.
"""

__version__ = '0.2'
__date__ = '2016-04-13'

guangningyu

function statusHelper(response) {
  if (response.status >= 200 && response.status < 300) {
    return Promise.resolve(response);
  }
  return Promise.reject(new Error(response.statusText));
}

/* Function: handle the async api call
 * Params:
 *   url: api url