Js function set

Js function set · String (String) 1. declare var myString = new String ("Every good boy does fine. "); var myString =" Every good boy does fine. "; 2. string connection var myString = "Every" + "good boy" + "does fine. "; var myString =" Every "; myString + =" good boy does fine. "; 3. truncates a string // truncates the character var myString = "Every good boy does fine, which starts with 6th characters. "; var section = myString. substring (6); // Result: "good boy does fine. "// truncate the 0th-bit start-to-10th-bit character var MyString = "Every good boy does fine. "; var section = myString. substring (11th); // Result: "Every good" // capture the character var myString = "Every good boy does fine from the second to the last 6th. "; var section = myString. slice (11,-6); // Result: "boy does" // The 4-character var myString = "Every good boy does fine is intercepted starting from the first digit. "; var section = myString. substr (6, 4); // Result: "good" 4. convert var myString = "Hello"; var lcString = myString. toLowerCa Se (); // Result: "hello" var ucString = myString. toUpperCase (); // Result: "HELLO" 5. String comparison var aString = "Hello! "; Var bString = new String (" Hello! "); If (aString =" Hello! ") {}// Result: true if (aString = bString) {}// result: false (two objects are different, although their values are the same) 6. returns the var myString = "hello everybody. "; // if the string cannot be retrieved,-1 is returned. if (myString. indexOf ("every")>-1) {}// result: true7. find the replacement string var myString = "I is your father. "; var result = myString. replace ("is", "am"); // Result: "I am your father. "8. special Character: \ B: backward character \ t: horizontal tab \ n: linefeed \ v: vertical Tab \ F: Paging character \ r: carriage return character \ ": Double quotation marks \ ': single quotation marks \: backslice lever 9. convert the character to Unicode encoded var myString = "hello"; var code = myString. charCodeAt (3); // returns the Unicode (integer) var char = String of "l. fromCharCode (66); // returns the character 10 with Unicode 66. convert the string to URL encoded var myString = "hello all"; var code = encodeURI (myString); // Result: "hello % 20all" var str = decodeURI (code ); // Result: "hello all" // encodeURIComponent () decodeURIComponent () 11. convert string to bas E64 encoding // base64Encode () base64Decode () usage same as above // ------------------------------------------------------------------- Number type (Number) 1. declare var I = 1; var I = new Number (1); 2. conversion between strings and numbers var I = 1; var str = I. toString (); // Result: "1" var str = new String (I); // Result: "1" I = parseInt (str); // result: 1 I = parseFloat (str); // result: 1.0 // Note: parseInt, parseFloat forcibly converts a string similar to "32G" to 323. determine whether it is a valid number var I = 123; var str = "String"; if (typeof I = "number") {}// true // some methods (such as parseInt and parseFloat) a special value NaN (Not a Number) is returned. // please note [note] In point 2nd. This method is Not suitable for determining whether a string is Numeric !! I = parseInt (str); if (isNaN (I) {} 4. number comparison // This knowledge is the same as [String comparison] 5. convert decimals to Integers var f = 1.5; var I = Math. round (f); // result: 2 (rounding) var I = Math. ceil (f); // result: 2 (returns the smallest integer greater than f) var I = Math. floor (f); // result: 1 (returns the largest integer smaller than f) 6. formatted to display the number var I = 3.14159; // formatted as a floating point number var str = I. toFixed (2); // Result: "3.14" // formatted as a floating point number of the five digits (from left to right, five digits, not enough) var str = I. toPrecision (5); // Result: "3.1415" 7. convert X-in numbers // not very familiar -. -var I = parseInt ("0x1f", 16 ); Var I = parseInt (I, 10); var I = parseInt ("11010011", 2); 8. random Number // return any decimal point between 0 and 1 var rnd = Math. random (); // returns any integer between 0 and n (excluding n) var rnd = Math. floor (Math. random () * n) // --------------------------------------------------------------------------- · Math object 1. math. abs (num): returns the absolute value of num 2. math. acos (num): returns the arc cosine of num 3. math. asin (num): returns the arcsin value of num 4. math. atan (num): returns the arc tangent value of num 5. math. atan2 (y, x): returns the arc tangent value of the operator whose y is divided by x. 6. math. ceil (num): returns the smallest integer greater than num 7. math. cos (num): returns the cosine of num 8. math. exp (x): returns the number 9 of x power based on the natural number. math. floor (num): returns the maximum integer 10 less than num. math. log (num): returns the natural logarithm of num 11. math. max (num1, num2): returns a large value of 12 in num1 and num2. math. min (num1, num2): return a smaller 13 in num1 and num2. math. pow (x, y): returns the value 14 to the power of y of x. math. random (): returns a random number between 0 and 1. math. round (num): return the value 16 after num rounding. math. sin (num): returns the sine of num 17. math. sqrt (num): returns the square root of num 1. 8. math. tan (num): returns the tangent of num 19. math. e: Natural Number (2.718281828459045) 20. math. LN2: natural logarithm of 2 (0.6931471805599453) 21. math. LN10: 10 natural logarithm (2.302585092994046) 22. math. LOG2E: log 2 is the base natural number (1.4426950408889634) 23. math. LOG10E: The base Natural Number of log 10 (0.4342944819032518) 24. math. PI: π (3.141592653589793) 25. math. SQRT1_2: the square root of 1/2 (0.7071067811865476) 26. math. SQRT2: square root of 2 (1.4142135623730951 )//------------------------------- ---------------------------------------- · Date type (Date) 1. declare var myDate = new Date (); // The current system time var myDate = new Date (yyyy, mm, dd, hh, mm, ss ); var myDate = new Date (yyyy, mm, dd); var myDate = new Date ("monthName dd, yyyy hh: mm: ss "); var myDate = new Date ("monthName dd, yyyy"); var myDate = new Date (epochMilliseconds); 2. obtain a part of the time var myDate = new Date (); myDate. getYear (); // obtain the current year (2 digits) myDate. getFullYear (); // Obtain the complete year (4 digits, 1970 -????) MyDate. getMonth (); // obtain the current month (0-11, 0 represents January) myDate. getDate (); // obtain the current day (1-31) myDate. getDay (); // obtain the current day X (0-6, 0 represents Sunday) myDate. getTime (); // obtain the current time (milliseconds starting from 1970.1.1) myDate. getHours (); // obtain the current hour (0-23) myDate. getMinutes (); // get the current number of minutes (0-59) myDate. getSeconds (); // obtain the current number of seconds (0-59) myDate. getMilliseconds (); // get the current number of milliseconds (0-999) myDate. toLocaleDateString (); // obtain the current date myDate. toLocaleTimeString (); // obtain the current time myDate. toLocaleStr Ing (); // obtain the date and time 3. calculate the previous or future time var myDate = new Date (); myDate. setDate (myDate. getDate () + 10); // The current time plus 10 days // similar methods are basically the same, starting with set. For details, refer. calculate the offset var I = daysBetween (beginDate, endDate) of two dates; // returns the number of days var I = beginDate. getTimezoneOffset (endDate); // returns the number of minutes. check the valid date // checkDate () only allows "mm-dd-yyyy" or "mm/dd/yyyy" Two formats of date if (checkDate ("2006-01-01 ")) {} // Regular Expression (check for four types of expressions: yyyy-mm-dd, yy-mm-dd, yyyy/mm/dd, and yy/mm/dd) va R =/^ (\ d {2} | \ d {4 }) [\/-] \ d {1, 2} [\/-] \ d {1, 2} $/; if (r. test (myString) {}// --------------------------------------------------------------------------- · Array (Array) 1. declare var arr = new Array (); // declare an empty Array var arr = new Array (10 ); // declare an Array of 10 lengths var arr = new Array ("Alice", "Fred", "Jean "); // use the value to initialize the array var arr = ["Alice", "Fred", "Jean"]; // use the value to initialize the array var arr = [["", "B", "C"] [1, 2, 3]; // declare a two-dimensional array 2. array access arr [0] = "123"; // assign a value to var str = arr [0]; // obtain arr [0] [0] = "123"; // assign a value to a multi-dimensional array 3. conversion between arrays and strings var arr = ["A", "B", "C", "D"]; // declaration // convert the array into a string var str = arr by separator. join ("|"); // Result: "A | B | C | D" // string is cut into an array arr = str. split ("|"); 4. traverse the array for (var I = 0; I <arr. length; I ++) {alert (arr [I]) ;}5. sort var arr = [12, 15, 8, 9]; arr. sort (); // result: 8 9 12 156. array var arr1 = ["A", "B", "C", "D"]; var arr2 = ["1", "2 ", "3", "4"]; // The two arrays of the prize are combined into a new array v Ar arr = arr1.concat (arr2); // result: ["A", "B", "C", "D", "1", "2 ", "3", "4"] // cut an array into two arrays (parameter 1: Start index, parameter 2: cut length) var arr3 = arr. splice (1, 3); // result: arr3: ["B", "C", "D"] arr ["A", "1", "2 ", "3", "4"] // cut an array into two arrays and add the new value var arr4 = arr in the original array. splice (1, 3, "AA"); // result: arr4: ["B", "C", "D"] arr ["A", "AA ", "1", "2", "3", "4"] // ------------------------------------------------------------------- · custom object 1. declaration: function myUser (uid, pwd) {t His. uid = uid; this. pwd = pwd | "000000"; // default value: this. show = showInfo; // method} // The following functions are not custom objects and are methods of custom objects. continue to read the function showInfo () {alert ("username:" + this. uid + ", password:" + this. pwd)} 2. instantiation: var user = new myUser ("user", "123456"); var user = {uid: "user", pwd: "123456"}; 3. obtain and set alert ("username:" + user. uid); // get user. uid = "newuser"; // set user. show (); // call the show () method //----------------------------------------- ---------------------------- · Variable Function Flow Control 1. variable var I = 1; var I = 1, str = "hello"; 2. function funName () {// do something .} function funName (param1 [, paramX]) {// do something .} 3. nested functions // in some cases, you need to create a function that is unique to the function itself. function myFunction () {// do something. privateFunction (); function privateFunction () {// do something .}} 4. anonymous function var tmp = function () {alert ("only test. ");} tmp (); 5. delay function call var tId = setTime Out ("myFun ()", 1000); // call the myFun () function fucntion myFun () {// do something clearTimeout (tId) after a delay of 1000 milliseconds ); // destroy object} 6. process control if (condition) {} else {} switch (expression) {case valA: statement; break; case valB: statement; break; default: statement; break;} 7. exception capture try {expression} catch (e) {} finally {} // do not handle any exception window. onerror = doNothi Ng; function doNothing () {return true;} // attribute available for the exception class description: exception description (IE, NN) fileName: exception page URI (NN) lineNumber: exception row (NN) message: exception description (IE, NN) name: Error Type (IE, NN) number: Error Code (IE) // error message (compatible with all browsers) try {} catch (e) {var msg = (e. message )? E. message: e. description; alert (msg);} 8. speed up script execution-avoid using eval () function-avoid using the with keyword-streamline the assignment of repeated expressions to the minimum-use indexes in large objects to find Arrays-reduce document. write () usage // --------------------------------------------------------------------------- · browser features (navigator) 1. browser name // IE: "Microsoft Internet Explorer" // NS: "Netscape" var browserName = navigator. appName; 2. browser version bar browserVersion = navigator. appVersion; 3. client operating system var isW In = (navigator. userAgent. indexOf ("Win ")! =-1); var isMac = (navigator. userAgent. indexOf ("Mac ")! =-1); var isUnix = (navigator. userAgent. indexOf ("X11 ")! =-1); 4. determines whether an object, method, attribute, // when an object, method, or attribute is not defined, undefined or null is returned. These special values are false if (document. images) {} if (document. getElementById) {} 5. check if (navigator. userLanguage) {var l = navigator. userLanguage. toUpperCase ();} 6. check whether the browser supports Cookies if (navigator. cookieEnabled) {}// --------------------------------------------------------------------------- · control the browser window (window) 1. set the browser size window. resizeTo (800,600 ); // Adjust the browser size to X window. resizeBy (50,-10); // increase or decrease the size of the window in the original size. 2. adjust the position of the browser window. moveTo (10, 20); // positions the browser to X: 10 Y: 20 window. moveBy (0, 10); // move the position (offset) on the original position 3. create a new window var win = window. open ("about.htm", "winName", "height = 300, width = 400"); // The alwaysLowered parameter is always behind other browser windows (NN) alwaysRaised // always in front of other browser windows (NN) channelMode // whether it is in navigation mode (IE) copyhistory // copy the history to the new window (NN) dependent // close a new window when its main window is opened (NN) Fullscreen // full screen mode (none of the related toolbar) (IE) location // whether to display the address bar (NN, IE) menubar // whether to display the menu bar (NN, IE) scrollbars // whether to display the scroll bar (NN, IE) status // whether to display the status bar (NN, IE) toolbar // whether to display the toolbar (NN, IE) directories // whether to display the link bar (NN, IE) titlebar // whether to display the title bar (NN) hotkeys // display the menu shortcut key (NN) innerHeight // The height of the content area (NN) innerWidth // content area width (NN) resizable // whether the size can be adjusted (NN, IE) top // the size of the window from the desktop border (NN, IE) left // the size of the window from the left border of the desktop (NN, IE) height // The window height (NN, IE) width // browse Device width 4. communicate with new window win. focus (); // get the focus win.doc ument for the new window. write ("abc"); // operate win.doc ument in the new window. close (); // end the stream operation opener. close (); 5. mode window. showModalDialog ("test.htm", dialogArgs, "param"); // pass the window object. showModelessDialog ("test.htm", myFunction, "param"); // pass the function window. dialogArguments // dialog box access the Object window passed by the parent window. returnValue // value returned by the "obtain parent window" dialog box // parameter center // dialogHeight of the window center // dialogWidth of the window height // dialogTop of the window width // window Distance from the port to the top margin of the screen: dialogLeft // distance from the window to the left of the screen to the edge // border style (raised | sunken) help // display the help button resizable // whether the window size can be changed status // whether the status bar is displayed // example <script> function openDialog (myForm) {var result = window. showModalDialog ("new.html", myForm, "center ");} </script> <form action = "#" onsubmit = "return false"> <input type = "text" id = "txtId"> <input type = "button" id = ""btnChk" value = "verify whether it is available" onclick = "openDialog (this. form); "> </form> // another New.html <script> window. dialogArguments. btnChk. enabled = false; // set the button in the parent window to unavailable // do something to check the Id. window. write ("User Id:" + nvidialogarguments.txt Id. value + "usable! "); // Get the value of the text box </script> // ------------------------------------------------------------------- · Management Framework webpage (frames) 1. create a framework architecture webpage