eloquent javascript 3rd edition

Brief introduction:The basic JavaScript Tutorial (8th Edition) introduces JavaScript and related CSS, DOM, Ajax, jquery and other technologies. Starting with the JavaScript Language Foundation, the book discusses images, frames, browser windows, forms, regular expressions, user events, and cookies, and adds two chapter

The ECMAScript variable may contain values for two different data types: the base type value and the reference type value. A primitive type value refers to a simple data segment, whereas a reference type value refers to an object that may consist of multiple values.When assigning a value to a variable, the parser must determine whether the value is a base type value or a reference type value. The 3rd chapter discusses 5 basic data types: Undefined, Nu

2nd chapter, using JavaScript in HTML HTML introduces external JS script should not be placed between scripts because it will not be executed Recommendation: put the script into the The contents of the Content The 3rd chapter, the basic concept Identifier The first character must be a letter, an underscore (_), or a dollar sign ($), which is effectively named as a letter, nu

value of the split position, the latter sequence is larger than the value of the split position varpartitionpos=partition (elements, low, high); //continuation of recursive ordering of previous sequencesSort (elements, 0, partitionPos-1); //continuation of recursive ordering of post sequencesSort (Elements, partitionpos+1, high); }}varelements = [3, 1, 5, 7, 2, 4, 9, 6, 10, 8];console.log (' Before: ' +elements); sort (elements,0, Elements.length-1); Console.log (' After: ' + elements);Effic

IDgetElementsByTagName (tagname) return a collection of objects in an array--document that all elements are tagnameGetelementsbyclassname (classname) return a collection of all objects in the array--document that are named ClassName (this method is new in the HTML5 DOM)* Here's a small thing to do, because HTML5 DOM provides getelementsbyclassname, so there may be browsers that don't. But I don't think so, so I can hand-getelementsbyclassname aThere are tutorials and code in the book, and I'll

Seventh Chapter ArrayFirst, create an arrayUsing the array direct amount is the simplest method:var empty=[]; var primes=[1,3,5,7,11]; var m=[1.1, "a",true]; var b=1024; var table=[b,b+1,b+2]; var bc=[[1,{x:1,y:2}],[2,{x:3}]]// If a value is omitted from the direct amount, the undefined value is assigned by default var count=[1,,3];The allowed elements at the end of an array's direct amount are comma:var a=[1,2,]; // two elements are 1 and 2, respectively var b=[True,,]; // Two elements are t