CSS grouping and nesting:
<style type=”text/css”>
H1, h4, p {// packet
color:green;
}
</style>
.marked {} class = marked tags
.marked p {} for all class = "Marked" in the element p element specifies a pattern
p.marked {} as long as the p tag and class = "Marked" style will be changed
CSS display:
div {visibility: hidden;} In this manner remain its original features
div {display: none} This hidden labels directly, nor characterized
CSS positioning:
The Position : static (from top bottom left right affected) / relative (relative positioning element is positioned relative to its normal position) / Fixed (stationary) / adsolute (absolute position of an element positioned nearest positioned relative to the parent elements, if not already positioned parent element, the relative <HTML> ) / Sticky
CSS Align:
Align = left-Text : Center text is centered
Margin : Auto elements centered, center the image
JS：javascript
HTML (decide what page to display data) + CSS (decision Page Layout) + JS (or the server and user interaction, determine the behavior of the page)
JS : Halo front-end programming, scripting language, easy to learn, is based on HTML + CSS , marking tools: VSCode Sublime notepad browser helper debugging code
JS need to write in the <script> </ script> , the script can be placed in <head> or <body> Lane
Window.alert () playing block
Document.write () the contents written in HTML in
Console.log () writes browser-based console
Note: JS in case sensitive
Single-line comments: //
Multi-line comments: / * * /
JS data types
Digital 3.14 1001 123e3 = 123 * 10 ^ 3
String using single and double quotation marks
Array [1,3,4,5] array
Object { name: 'HQW', Age: 20 is }
When the definition data need to use the var keyword to define variables
Function function + fun function type + (parameter) + { function body } , wherein after line of code written, and needs; semicolon
Things to consider when defining variables:
1, the variable must begin with a letter, you use the $ or _ can be, but is not recommended
2, case sensitive
3, when the definition of variables, requires the use of var , the need to define a variable, the definition can be assigned at the time =
4, a statement can define a plurality of variable var name = 'icq', gae = 20, job = 'hacker'
5, no variable initialization, equivalent to undefined
JS data types
Value Type: String String / number numeric / boolean / NULL air / undefined undefined
Reference types: Object / Array / function
Var x undefined
Var = 123.12 Digital
Var po = "spring" statement
Var fo = ture boolean type
Var array_te=new Array();
Array_te[0]=”hellow”
Array_te[1]=”icq”
A=[“hellow”,”icq”]
Object:
Used to describe an abstract concept, people { properties, methods }
Var car={type:”BYD”,model:500,color:white,do:function(){“可以跑”}}
The use of property for the object:
Name=car.type;
Color=car[“color”];
For object methods of use:
Deal=car.do();
Defining and using functions:
No-argument function
Function fun()
{
Statement body;
}
There are function parameters
Function fun(a,b)
{
Body function ; // manifestation of a and b treatment
}
Function returns a value
Function fun(){
Return results
}
Robots.txt is generally robots protocol to prevent network search engines to crawl the site sensitive pages exist in the root directory of the site's robots.txt file, which is written clearly which pages are not allowed to crawling.
Variables: variable scope according to points
Local variables: variable declared inside a function, only to be used within the function
Global variables: variable declared outside a function, all the scripts and functions available on the web page to use him
String processing
String required '' or '' enclosed, may be used to access the subject embodiment each character string;
A string of special characters if you need to print out, you need to use the escape character \ , is to allow the escape character retains its original meaning, and not be treated as special characters to use
Use string.length get the length of the string, where the escape character \ is not length
Special characters: ' "\ \ R & lt \ T \ B backspace \ f feed
String can be treated as an object, var = S new new String ( 'Test') is equivalent to S = 'Test' ;
Properties: length (length), the prototype (added to allow the object properties and methods)
Methods: charAt () Returns the character at the specified position
index () Returns the character index
split () the string into an array of strings
substr (n) taken string, before the n characters removed
substring (a, b) intercept a and b-1 string between
toString () object is converted string
toLowerCase () turn lowercase toUpperCase () turn uppercase
Use ngrok carried out within the network resource mapping
Step1 : Access https://www.ngrok.cc/user.html login, find the "Open Tunnel", tunnels and create open, download linux client, in
./sunny clientid + tunnel id
