Some basic DIY functions

Install：

Usage：

Functions：

Get the value of name in querystring:

  query(name, querystring)
  
  // query('hello', '?hello=js') => 'js'

Serilize data:

  serialize(data)

  // serialize({hello: 'js', hi: 'test'}) => 'hello=js&hi=test'

Search DOM with selector:
```
  $(selector)
```
Remove the node from DOM:
```
  removeNode(node)
```
Insert node after target as a sibling in DOM:
```
  insertAfter(node, target)
```
Add className, which could be an array or a string, to the class list of target
```
  addClass(node, className)
```
Remove className, which could be an array or a string, from the class list of target
```
  removeClass(node, className)
```

Get the absolute URL of a relative URL in current page

  getAbsoluteUrl(url)

  // getAbsoluteUrl('/abc') => 'https://www.npmjs.com/abc'

Remove the element of index from arr

  removeItemByIndex(index, arr) 

  // removeItemByIndex(1, [1,2,3]) => [1, 3]

ev-test