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javascript 中的this关键字总结 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. JavaScript 中函数的调用有以下几种方式 作为对象方法调用，作为函数调用，作为构造函数调用，和使用 apply 或 call 调用。 在 JavaScript 中，函数也是对象，因此函数可以作为一个对象的属性，此时该函数被称为该对象的方法，在使用这种调用方式时，this 被自然绑定到该对象。 Var point = { x : 0, y : 0, moveTo : function(x, y) { this.x = this.x x; this.y = this.y y; } }; point.moveTo(1, 1)/ this 绑定到当前对象，即 point 对象. Function makeNoSense(x) { this.x = x; } makeNoSense(5); x;/ x 已经成为一个值为 5 的全局变量. 我们仍然以前面提到的 point 对象为例，这次我们希望在 moveTo 方法内定义两个函数，分别将 x，y 坐标进行平移。 使用 apply 或 call 调用.

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sort排序函数使用 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. Var arr=[2,14,34,56,76,1,3];. Console.log(arr.sort() ;/ [1, 14, 2, 3, 34, 56, 76]. 比较函数应该具有两个参数 a 和 b，其返回值如下. 若 a 小于 b，在排序后的数组中 a 应该出现在 b 之前，则返回一个小于 0 的值。 若 a 等于 b，则返回 0。 若 a 大于 b，则返回一个大于 0 的值。 Function ascend(a, b) {. Function desc(a, b) {. Arrsort(ascend);/ [1, 2, 3, 14, 34, 56, 76]. Arrsort(desc);/ [76, 56, 34, 14, 3, 2, 1]. Return Math.random() 0.5? Arrsort(radom);/ [56, 14, 34, 2, 3, 1, 76]. Return a.indexOf(‘a’)= -1? Var arr=['好','是','谁','你','我'];.

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Javascript中类似数组的对象 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. Console.log(obj.prototype);/ []. Console.log(Object.prototype.toString.call(obj.prototype) ;/ [ object Object]. 例子来源 http:/ www.clovery.org/question-the-object-similar-array-in-js.html. Var test=function(){ console.log(arguments); console.log(arguments.length); console.log(arguments.constructor); } test();/ 依次输出 [] 0 function Object() { [native code] }. Var $A = function(obj) { return Array.prototype.slice.call(obj); };. Leave a Reply Cancel reply.

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迷路的猫少年 | ｛朴素的生活，遥远的梦想｝ | Page 2

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Skip to primary content. Skip to secondary content. Newer posts →. March 30, 2014. March 29, 2014. Newer posts →. JavaScript callback function 理解. HTML5 FileSystem API 介绍. Proudly powered by WordPress.

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老夏天 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. April 27, 2014. This entry was posted in 生活. Leave a Reply Cancel reply. Your email address will not be published. Required fields are marked *. You may use these. A href= title= abbr title= acronym title= b blockquote cite= cite code del datetime= em i q cite= strike strong. JavaScript callback function 理解. HTML5 FileSystem API 介绍. Proudly powered by WordPress.

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迷路的猫少年 | ｛朴素的生活，遥远的梦想｝

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Skip to primary content. Skip to secondary content. April 27, 2014. Continue reading →. April 20, 2014. JavaScript callback function 理解. HTML5 FileSystem API 介绍. Proudly powered by WordPress.

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猫少年 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. April 27, 2014. Continue reading →. April 20, 2014. JavaScript callback function 理解. HTML5 FileSystem API 介绍. Proudly powered by WordPress.

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Math.PI的相关运算 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. 1144 Prefix Increment Operator The production UnaryExpression :. UnaryExpression is evaluated as follows:. 2Call GetV alue(Result(1) . 4Add the value 1 to Result(3), using the same rules as for the operator (see 11.6.3). 5Call PutV alue(Result(1), Result(4) . 11131 Simple Assignment ( = ). The production AssignmentExpression : LeftHandSideExpression = AssignmentExpression is evaluated as follows:. 3 Call GetValue(Result(2) . Leave a Reply Cancel reply.

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HTML5 FileSystem API 介绍 | 迷路的猫少年

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Skip to primary content. Skip to secondary content. HTML5 FileSystem API 介绍. 目前FILE IO 的实现方式主要有臭名昭著的 ActiveX. 这里主要介绍HTML5 的 FileSystem API。 1文件读取接口: File/Blob, FileList, FileReader. 2创建和写入接口: BlobBuilder, FileWriter. 3目录和文件读取接口: DirectoryReader, FileEntry/DirectoryEntry, LocalFileSystem. Var db = window.openDatabase( 'MyDB', / dbName '1.0', / version 'test database', / description 2 * 1024 * 1024, / estimatedSize in bytes (2MB) function(db) {} / optional creationCallback );. This entry was posted in html5.