HighCharts源码学习---扩展函数wrap和扩展对象 extendClass

来源：互联网发布：java连接zookeeper报错编辑：程序博客网时间：2024/06/07 05:55

Highcharts.wrap在原函数的基础上扩展原函数

 /**     * Wrap a method with extended functionality, preserving the original function     * @param {Object} obj The context object that the method belongs to     * @param {String} method The name of the method to extend     * @param {Function} func A wrapper function callback. This function is called with the same arguments     * as the original function, except that the original function is unshifted and passed as the first     * argument.     */

var wrap = Highcharts.wrap = function (obj, method, func) {     //备份原函数     var proceed = obj[method];     obj[method] = function() {     //拷贝一份实参     var args = Array.prototype.slice.call(arguments);     //将原函数的引用放到第一个入参     args.unshift(proceed);     //保持上下文调用func     func.call(this, args);     }

利用wrap重新封装parseInt()

  wrap(window, parseInt, function(proceed, str, scale) {     if(typeof str === 'number') return proceed.call(this, str);     var hexChars = 'abcdef', decChars = '9';     var hasHex = false,hasDec = false,i = 0, len = str.length;     if(!scale) {     if(str.charAt(0) === '0') {     if(str.charAt(1) === 'x') {     return proceed.call(this, str, 16);     }     else {     for(i = 0;i < len; i++) {     var char  = str.charAt(i).toLowerCase();     if(hexChars.indexOf(char) > -1) hasHex = true;     if(decChars.indexOf(char) > -1) hasDec = true;     }     }     if(hasHex) {     return procced.call(this, str, 16);     }else if(hasDec) {     return procced.call(this, str, 10);     } else {     return procced.call(this, str, 8);     }     }     return procced.call(this, str, 10);     }     })

Highcharts扩展原型对象

 /**     * Extend a prototyped class by new members     * @param {Object} parent     * @param {Object} members     */    function extendClass(Parent, members) {        var object = function () {        };        object.prototype = new Parent();        extend(object.prototype, members);        return object;    }

0 0