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CORS detailed explanation and treatment method reference resources: http://javascript.ruanyifeng.com/bom/cors.html CORS (cross origin resource sharing): cross source resource sharing allows browsers to send XMLHttpRequest requests to from different sources, which overcomes the limitation that ajax can only be used from the same source. Moder ...

Echarts quick start Import the echorts.js filePrepare a box to present the chartInitialize the ecarts instance objectPrepare configuration itemsSet the configuration item to the ecarts instance object <div style='width: 600px; height: 400px;'></div> <script src="./lib/echarts.js"></script> <script> // Initializ ...

1. Find the largest value in the array, arr = [7,4,8,1,5] console.log(Math.max(7,4,8,1,5)); console.log(Math.max.apply(1,arr)); 2. Encapsulate a function to generate n-bit random verification code    function randomCode(num) {             var str = '0-9a-zA-Z';             var arr = '';             for (var i = 0; i < num; i++) {         ...

Last time, we introduced two rules in the "function context" this pointing problem ① 1.2 rule 1  : Execute directly with parentheses, and the context is a window object ② 1.2 rule 2   : The context is the object or number that is called from the object or enumerated in the array. group Let's continue to introduce some o ...

Recently, in the research of small programs, we used Jingdong React based small program development framework Taro. Compared with mpvue and uni app, Taro is more elegant and stable. Big factories are iterating, but it is different. In a word, there are fewer pits ~ Pre knowledge Before reading this tutorial, you need to master the developme ...

 *  Timer: set a timer and set the waiting time. When the execution time is reached, the browser will execute the corresponding method  *  *  [common timer]  *    setTimeout([function],[interval])  *    setInterval([function],[interval])  *  *        [function]: the method ...

Common methods of traversing arrays         1. forEach                 Note: forEach is the simplest and most commonly used array traversal method. It provides a callback function that can be used to process each element of the array. By default, there is no return value. The parameters of the callback ...

Prototype development method + inheritance Methods on extended prototypes Extension of array indexOf // console.log(Array.prototype.indexOf); // Return function in standard browser, and return undefined in IE8 and if (!Array.prototype.indexOf) { Array.prototype.indexOf = function (val, index) { index = typeof index === 'undefine ...

Common methods of arrays Array.length length is an instance property of Array that returns the number of elements in the array and is always greater than the subscript of the last item in the array let arr = [1, 2, 3, 4] console.log(arr.length) // 4 indexOf indexOf('ele',fromIndex) Parameter 1: Elements of the query Parameter 2 (optional) ...

HTML5 final assignment: red wine theme website design - brief red wine introduction web page (7 pages) HTML+CSS+JavaScript final assignment HTML code student web page course design final assignment Download Web page design and production finished products Common web design topics include individuals, food, companies, schools, tourism, e-com ...