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= bar.bind(foo).bind(sed).bind(fiv);func(); //? The answer is that the two will still output 3, not the expected 4 and 5. The reason is that in JavaScript, multiple bind () is not valid. For a deeper reason, the implementation of BIND () is equivalent to using a function to wrap a call/apply inside, and the second bind () is equivalent to wrapping the first bind (), so the second bind is not valid.Apply, call, bind comparisonSo what are the s

. The code below is validated.function person (name){This.name=name;This.showme=function (){alert (this.name);}};Person.prototype.from=function (){Alert (' I come from prototype. ');}var father=new person (' JS ');//For the following demonstration using the ShowMe method, using the JS parameter, the actual use of no parametersalert (father.constructor);//view constructor, Result: function person (name) {...};function Subper (){}subper.prototype=father;//, watch this.Subper.prototype.constructor=

: functionisPrime(number) {// If your browser doesn‘t support the method Number.isInteger of ECMAScript 6,// you can implement your own pretty easilyif(typeofnumber !== ‘number‘ || !Number.isInteger(number)) {// Alternatively you can throw an error.returnfalse;}if(number Conclusion This article discusses several other important JavaScript concepts in the form of questions and exercises that are important to the

%a2%e5%9b%ad%23abcAs you can see, uri.escapedatastring encodes a colon (:), slash (/), space, Chinese, pound sign (#), so this method cannot be used for URL encoding, but can be used to encode parameters. Functions like the encodeURIComponent method in JavaScript.Summary　　The recommended practice in JavaScript is to encode the URL portion of the URI with encodeURI, using encodeURIComponent to encode the parameters passed in the URI.The recommended pra

, uri.escapedatastring encodes a colon (:), slash (/), space, Chinese, pound sign (#), so this method cannot be used for URL encoding, but can be used to encode parameters. Functions like the encodeURIComponent method in JavaScript.Summary　　The recommended practice in JavaScript is to encode the URL portion of the URI with encodeURI, using encodeURIComponent to encode the parameters passed in the URI.The recommended practice in C # is to encode the UR

the following two sections of code, you should understand the operation mechanism of the closure. (from teacher Ruan) This topic summed up real second ~ ~Code snippet one. 12345678910 varname = "The Window";varobject = {　　name : "My Object",　　getNameFunc : function(){　　　　returnfunction(){　　　　　　returnthis.name;　　　　};　　}};alert(object.getNameFunc()()); Code snippet two. 1234567891011 varname = "The Window";varobject = {　　name : "My Object",　　getNameFunc :

normal circumstances this situation is silently ignored, and in the strict mode will be error. ConclusionJust as with other technical languages, the deeper you know about JavaScript, how it works, and why it works, you will be proficient in mastering and using the language. Conversely, if you lack the knowledge of JS mode, you will encounter a lot of problems. Understanding some of the details of JS syntax or functionality will help you improve

NanyiDate: November 7, 2012The first and second sections of this series introduce JavaScript module prototypes and theoretical concepts, and today we show you how to use them in combat.I am using a very popular library require.js.First, why use Require.js?At the earliest, all JavaScript code was written in a single file, as long as the file was loaded. Later, the code more and more, a file is not enough, mu

The examples in this article describe the way JavaScript implements drag-and-drop and close-layer windows. Share to everyone for your reference. The specific analysis is as follows: This is based on the JAVASCRIPT+CSS implementation layer drag code, the difference is that it when dragging the window will change color, so that the operation experience better, you can run code to view the effect. It can also

)) { if(elems.style) Elems.style.backgroundColor=Scolor; } } } Script> Head> Body> Divclass= "Replace"> spanclass= "title">JavaScript native 16 binary color value to RGB valuespan> formname= "RGB"> inputvalue= "FFFFFF"maxlength= "7"size= "+"name= "Hex" /> inputonclick= "Setbgcolorbyid (' colorsample ', this.form.hex.va

is another assignment expression:A = {}First, calculate a.b = Expression1, and run the step by assigning an expression in (3)Step1 first get a quote (OBJ1, "B")Step2 parsing expression1{Expression1 parsingStep1 get quoted (GLOBAL, "a")Step2 get an object OBJ2Step3 value, still OBJ2STEP4 assigns the reference (GLOBAL, "a") to the STEP3 resultSTEP5 return OBJ2}Step3 value, the result is also OBJ2Step4 (OBJ1, "B") is assigned a value of OBJ2STEP5 return OBJ2Final Result:OBJ1: {n:1, b:obj2}OBJ2: {N

HTML> Head> Scripttype= "Text/javascript"> functionMoveNext (object,index) {if(Object.value.length==4) {document.forms[0].elements[index+1].focus (); } } functionShowresult () {varF=document.forms[0]; varresult=""; for(varI=0; I4; I++) {result+=F.elements[i].value; } alert (result); }Script>Head> Bodyonload= "Document.forms[0].elements[0].focus ();"> form> inputtype= "text"size= "3"maxlength= "4"onkeyup= "MoveNext (thi

code can not find the value of the variable when it is RHS, the Referenceerror exception will be thrown, if it is LHS cannot find the variable, in non-strict mode, in the global scope, a variable with that name, in strict mode, will throw an exception similar to RHS.For example:In the above code, LHS for B did not find the variable, a variable B with the same name was created in the global scope, and the B variable can be accessed outside of the function init.If you change the code to the follo

Town Field Poem:The Pure Heart sentiment wisdom language, does not have the world name and the benefit. Learn water under the hundred rivers, give up arrogant slow meaning.Learn to have a small return to feed root, willing to cast a conscience blog. Sincere in this writing experience, willing to see the text to inspire.——————————————————————————————————————————Code1 DOCTYPE HTML>2 HTML>3 Head>4 Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8"/>5 title>title>6 Scriptt

1. There are some wonderful phenomena in the figures in JavaScript.You can do your own experiment in the Chrome console:1 = = = 1.0; TrueAccustomed to the strong type of language, such as JAVA,C,OC see this conclusion is still a little confused. This is because within JavaScript, all numbers are stored as 64-bit floating-point number, including positive. It complies with the IEEE 754 standard.Look again, the calculation of floating-point numbers.0.1 +

. The narrowing of the array is reduced () and reduceright (), the only difference is that one starts from the array and the other is the end of the array, both of which can accept four parameters, the first one is the previous item of the array, the second is the current item, the index value, and the group, So the difference between the two methods is that it depends on the convenience array from the beginning, with the simple code example below: var array = [1,4,6,2,7,3 var result = Arr

this.a + this.b + c + d; } var o = {a:1, b:3}; add.call(o, 5, 7); // 1 + 3 + 5 + 7 = 16 //第一个参数接收的是你想作为this的对象add.apply(o, [10, 20]); // 1 + 3 + 10 + 20 = 34 function bar() { console.log(Object.prototype.toString.call(this)); } bar.call(7); // "[object Number]" Bind method with thisThe Bind method is provided by ES5, so ie9+ supports 123456789 function f(){ return this.a; } var g = f.bind({a : "test"}); //想把某个对象作为this的时候，就把它传进去，得到一个新对象gconsole.log(g()); // test //重复调用的时

1. PrefaceArguments, caller, what is callee?What is the role in JavaScript? This article will do some basic introduction.This article was reproduced from: http://blog.csdn.net/oscar999/article/details/85113352. ArgumentsArguments: When a function is called, a hidden object named arguments is automatically generated inside the function. The object is similar to an array, but not an array. You can use the [] operator to get the arguments that are passed

position), returns the first occurrence of the position (calculated starting from 0)97.string.lastindexof (Searchstring[,startindex]) The last occurrence of the position.98.string.match (regexpression) to determine if the characters match.99.string.replace (regexpression,replacestring) replaces the existing string.100.string.split (delimiter) returns an array of stored values.101.string.substr (Start[,length]) takes a string from the first to the specified length.102.string.tolowercase () turns

JavaScript full-width character to half-width (the contents of the input box with the parameter str)var $fullChar 2halfChar = function (str) { var result = '; for (var i = 0; i Gets the Unicode encoding of the current character var code = str.charcodeat (i); Unicode encoding range is all English letters and various characters If (Code >= 65281 Code Converts Unicode encoding of full-width characters to Un