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1 <!DOCTYPE HTML>2 <HTML>3 <Head>4 <MetaCharSet= "UTF-8">5 <title>JavaScript advanced Syntax 1-functions</title>6 </Head>7 <Body>8 <Script>9 functionPrint (p) {Ten Console.log (P.tostring (), p) One } A /* - var arr= new Array (); - Arr.push (1); the Arr.push (2); - Arr.push (3); - Arr.push (4); - print (arr); + Print (Arr.join (":")) - var arr2 = [5,6,7,8] + Print (Arr.concat (arr2)) A //each () methods for extending functions at Array.each = function (ARRAY,FN) { - For (Var i=0;i<array.length;i++) { - fn (array[i]); - } - } - Array.each (arr,function (v) { in print (v); - }) to + //callback function definition - function Add (X,Y,FN) { the this.x=x| | 1; * this.y=y| | 1; $ if (FN) {Panax Notoginseng fn (this.x + this.y); - } the } + A Add (3,5,function (v) { the if (v>5) { + alert ("Res >5") - }else{ $ Alert (res <=5 "") $ } - }) - the - //function-pass parameterWuyi //1. Arbitrary parameter passing (can be passed or transmitted in multiple parameters) the function Add (x, Y, z) { - this.x = x| | 0; Wu This.y = y| | 0; - this.z = z| | 0; About alert (this.x+this.y+this.z); $ } - - - Add (12,3,4,5); A //Cons: There is no such thing as high-level languages like Java that have the exact nature of a function. + //Tip: If you have a class that is a tool class, then the received parameter is preferably an object. the //conf={gridname: "", Gridcode: "", GridSize: ""} - function Gridutil (conf) { $ alert (conf["Gridname"]+conf["gridSize"]); the } the Gridutil ({gridname: "Zhangsan", GridSize: "}") the the //Pass the value or pass the address - var i = +; in var s = "one"; the function Add3 (i,s) { the i++; About s+= "--" the } the add3 (); the alert (i); + alert (s);//prove that the underlying variable passes the value. - the var o = {name: "Zhangdan"};Bayi function Change (o) { the o["name"] = "javascript"; the } - Change (o); - alert (o.name); proves that the custom object is transmitted by the address. the the the //function recursion the function Add4 (start,end) { - var num= 0; the num + = start; the if (start<end) { the num + = ADD4 (start+1,end);94 } the return num the } the Alert (ADD4 (1,100));98 About - //Agent Function--------to determine the new function returned by the program (function of production function)101 //Simulation Database102 var person = {"Jim": ' m ', "Lili": "W"}103 var test = function (name) {104 if (person[name]== "M") { the return function (NK,WK) {106 alert (nk+ "" +wk);107 }108 }else if (person[name]== "W") {109 return function (NK,WK,FK) { the alert (nk+ "+wk+" "+FK");111 } the }113 } the Test ("Jim") ("OK", "OK"); the Test ("Lili") ("OK", "OK", "no"); the ///front-end code is not commonly used, which complicates the code. Schemas are common. 117 118 */ 119 - //the eval () function--"parses a string into a function and executes121 varStr= "var show = function () {alert ()} ()";122 eval (str);123 //Application Scenario: The database sometimes returns a string (as long as a JS array);124 vara= "[A]"; the vararr=eval (a);126 for(varI= 0; I<Arr.length;i++){127 Console.log (Arr[i]); - }129 the 131 </Script> the </Body>133 </HTML>
JavaScript design mode-1. Functions
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