我在第27行（小提琴：https://jsfiddle.net/hh82p4fj/1/）
中遇到问题为什么我的财产在同一个关闭时指向onOptionsItemSelected()？
undefined "use strict";
function callself(instance, callback) { // saves 'this' state for reuse inside another function
return function () {
var argumentsList = [this], i;
for (i = 0; i < arguments.length; i = i + 1) {
argumentsList.push(arguments[i]);
}
return callback.apply(instance, argumentsList);
};
}
var Namespace = function () {
var settings = { handler: this.method };
this.initialize = function () {
$.fn.myPlugin = callself(this, function (that, userInput) {
/* this = Namespace
that = jQuery element
userInput = provided in line 30 as parameter
*/
console.log(this);
console.log(that);
console.log(userInput);
console.log(settings.handler); // why why it's undefined?
});
$('body').myPlugin('someData');
};
this.method = function () { console.info('method'); }; // this method should be returned as reference in line 27, but it can not reah 'this` - don't know why
};
new Namespace().initialize();
，以保留jQuery callself上下文和ryginal对象闭包。
答案 0 :(得分：4)
问题是初始化的顺序。
当this.method尚未执行时，您正在使用this.method = function(){}来创建脚本，因此在创建设置对象时，this.method的值未定义。
var Namespace = function () {
//this should be set before `this.method` is referred
this.method = function () {
console.info('method');
};
var settings = {
handler: this.method
};
this.initialize = function () {
$.fn.myPlugin = callself(this, function (that, userInput) {
/* this = Namespace
that = jQuery element
userInput = provided in line 30 as parameter
*/
console.log(this);
console.log(that);
console.log(userInput);
console.log(settings.handler); // why why it's undefined?
});
$('body').myPlugin('someData');
};
};
答案 1 :(得分：1)
var settings = { handler: this.method };
指向settings.handler 而不是参考至this.method 但 {{ 1}}（执行时未定义）
this.method必须是对象才能被引用。
this.method
this.method = {}; //empty object var settings = { handler: this.method };=＆gt; ref {}
this.method=＆gt; ref {}
settings.handler
this.method = {}; //empty object var settings = { handler: this.method }; this.method = funtion(){}`// reference will be replaced=＆gt; ref funtion（）{}
this.method=＆gt; ref {}
settings.handler
this.method = {}; //empty object var settings = { handler: this.method }; this.method.use = function(){}=＆gt; ref {use：function（）{}}
this.method=＆gt; ref {use：function（）{}}
<小时/>
settings.handler