从另一个脚本访问javascript变量 [英] access javascript variable from another script

问题描述

我有以下结构：

I have the following structure

// script1.js

jQuery(document).ready(function($) {
    var somevar;
    $('somelem').myPlugin();
});


// script2.js

(function($) {
    $.fn.myPlugin = function(options) {

        // access and modify 'somevar' here so that it gets modified
        // in the function which called a plugin

    };
});

• 我想让'somevar'变量通过插件和I进行修改
  将能够在插件
  调用者函数的作用域中进一步处理已经修改的变量。


• 我不想使用全局变量。 b $ b
• 我没有看到将变量作为选项传递给插件，因为它
  将成为插件函数的本地，并且修改不会按照我的理解修改原始变量。 / li>
  
• 我可能误解了javascript的工作原理，所以任何
  的答案都是可以理解的。


• I want the 'somevar' variable to get modified by plugin and I would be able to work with already modified variable further in the plugin caller function's scope.
• I do not want to use global variable.
• I see no use of passing the variable as an option to a plugin as it would become local to a plugin function and modifying would not modify the original variable as I understand.
• I may misunderstand the concept of how javascript works, so any answer appreciated.

推荐答案

当你传递一个基本类型时，它是通过值传递的。但是，如果你传递一个对象，那么它会通过引用传递。所以，你可以做到这一点 -

When you pass a primitive type, it is passed by value. But, if you pass an object then it'll pass by reference. So, you can do that -

jQuery(document).ready(function($) {
    var somevar = {val: 5};
    $(document).myPlugin(somevar);
    alert(somevar.val);
});


// script2.js

(function($) {
    $.fn.myPlugin = function(options) {
        options.val ++;
        // access and modify 'somevar' here so that it gets modified
        // in the function which called a plugin

    };
})(jQuery);

查看实时演示:: http://jsfiddle.net/rifat/EdRFm/

这篇关于从另一个脚本访问javascript变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！