- JavaScript (can manipulate HTML tags and CSS)
- Dom (API, provides a way to find tags in html, so that you can use JS to find the label or CSS to do the appropriate action)
- JQuery (used to encapsulate complex logic and operations into a package for external invocation)
javascript: <srcipt>...</script> Forms of existence: files, blocks generally written at the bottom of the body. ---Declaration variable: name = "Alex"; (global variable) &N Bsp var age=18, (local variable) ---Digital: var age = "; " Console.log (age,typeof age); age = parseint (age); &NB Sp Console.log (age,typeof Age); var = "18.9"; console.log (par Seint (age)); Console.log (parsefloat (age)); number (' 123 '); & nbsp parseint (' 123 '); ---String: Console debugging is available in the browser. var name = "abc"; var name = "ABC "; &nbs P Name.trim (); Remove null characters at the end of a string Name. charAt (0); Get the first character a name.substring; Get the data equal to 1 less than 2, here is b ---boolean: Boolean (1) true Boolean (0) false ---array: var li = [11,22,33]; var n = [44,55,66]; var li = Array (11,22,33); Li.push (88); Add 88 to Li (insert data back) Li.unshift ("abc"); Put strings into Li (insert data forward) Li.splice (1,0, ' Alex '); Put the ' Alex ' string in the 1 position, and parameter 0 is a fixed notation. i = Li.pop (); The Li tail data is moved out and assigned to I (removed from the tail) i = Li.shift (); Move the Li's head value out and assign the value to I (remove from head) Li.splice; Remove 2 elements from the 1 position in Li (the first parameter is the position, the second parameter is the number) Li.slice (0,2); Slices, from 0 positions, to 2 (not counted), here is 11,22 m = Li.concat (n); Union, the Li and N are combined together and assigned to m Li.reverse (); Self-flipping changes to 33,22,11 m = li.join ('-'); '-' for delimiter,11-22-33 name = ' Zhaohong '; name.length; Get string length ---dictionary: dic = {"K1": ' v1 '} Creates a dictionary, is an object ---serialization and deserialization: s = json.stringify (DIC) will DIC The dictionary is serialized to a string m = Json.parse (s) will serialize S, deserialized to an object --undefined var name = "Jake" undefined If a value is not assigned to a defined variable, undefined such as: Var SS, ss is displayed as Undefiled, and the Boolean value is false& Nbsp;name = null points to a special address, a null boolean value of false ---Loop statement: LI = [11,22,33,44]; for (var item in Li) { Console.log (item), //output for index } var dic = {' K1 ': One, ' K2 ': 22 }; for (var item in DIC) { Console.log (item)//output is key } &NB Sp for (Var i=0;i<100;i++) { Console.log (i); } & nbsp for (var i=0;i<li.length;i++) { Console.log (i); } while ( true) { continue; break;} Same as a while loop in Python ---conditional statement: &NBSP;IF (condition) {}else if (condition) {}else{ } switch (name) { Case 1: Console.log (' 111 '); break; Case:   ; .... default: ...} ---exception handling: try{ }catch (e) { }finally{ } --- dom let js move obj = Foo () obj.xx document 1, find elements first, then manipulate elements. 2, getElementsByTagName () 3, getElementById (); & nbsp 4, Getelementsbyclassname (); <div> <div id= "N1" >c1</div> <a>test</a> <ul> &N Bsp <li>a</li> <li>b</li> <li>c</li> </UL> ; </div> <script src= "" type= "Text/javascript" > var nid = document.getElementById (' N1 ') Nid.innertext; View tag content Nid.innertext = "Jake"; Set tag content var li_list=document.getelementbytagname (' Li '); for Var i in li_list) { var item = li_list[i]; & nbsp item.innertext=i; } </SCRipt> Change the text C1 of the DIV to Alex, Console.log (Nid.innertext); Display label contents values in input are required. Value get Console.log (Username.value,pwd.value) ; <div> <div id= "num" >1</div> <input type= "button" value= "+1" onclik= "Add ();"/> </div> &nbs P <script type = "Text/javascript" > var nid = document.getElementById (' num '); var text = nid.innertext; Text = parseint (text); text + = 1; Nid.innertext = text; </script> Step: &N Bsp 1, find num 2, get content 3, auto- 1, event 2, select Find (selector) 3, content modification get & nbsp InnerText-Label Intermediate text content innerhtml-Label Middle Content Special: input, select, textarea use value to get values ---search box example: 1, onfocus,onblur 2, select the search box. 3, Get search box content value <body> <input type= "text" id= "search" value= "Please enter the keyword" onfocus= " Focus (); "Onblur=" Blur (); "/> <script type=" Text/javascript "> & nbsp function Focus () { var Nid=document.getelementbyid (' Search '); var value=nid.value; &NBS P if (value== "Please enter keywords") { nid.value= "";   ; } } &N Bsp function () { var Nid=document.getelemEntbyid (' search '); var value=nid.value; if (!value.trim ()) { Nid.va Lue = "Please enter keyword"; } } </script></body> ----Creating tags: <script> // Create tags, add to container var nid=document.getelementbyid (' container '); var tag = "<input type= ' text '/>" container.insertadjacenthtml (' beforebegin ', tag) </script> var creatobj = documet.createelment (' A '); createobj.href = "http://www.etiantian.org"; createobj.innertext = "Old boy education"; & nbsp; var nid = Document.getelementByid (' container '); Nid.appendchild (createobj); ---Setting label properties: Nid.setattribute (' name ', ' AAA ') getattribute delattribute ----form: <body> <form action= "/tijiao" method= "POST" > &NB Sp <input name= "Query" type= "text"/> <input type= "Submit" value= "Submit"/> </form> </body> --page refresh: Window.location.reload ()--page jump: windows.location.href = "http://www.etiantian.org" --timer: < script> setinterval ("Action", "interval") setinterval ("alert (' 123 ') ) </script>---filter: <table> <TR><TD >header 1</td></tr> <tr>≪td>value 1</td></tr> <tr><td>value 2</td></ tr> </table> $ ("Tr:eq (1)") $ (' tr '). EQ (1) num = Input () TEMP = "Tr:eq (" + num + ")" $ (temp)
Python automation development from shallow to deep-advanced (Script,dom,jquery Foundation)
