使用JavaScript变量作为函数名称? [英] Use JavaScript variable as function name?

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问题描述

  jQuery(document).ready(function(){
var actions = new Object();
var actions;
actions [0] ='create';
actions [1] ='update';
for(key in actions ){
//对话框
var actions [key] + Dialog = function(){
$('#'+ actions [key] +'dialog')。dialog('destroy' );
$('#'+ actions [key] +'dialog')。dialog({
resizable:false,
height:600,
width:400,
modal:true,
按钮:{
取消:function(){
$(this).dialog('close');
}
}
});
};
}
});

我想在循环中创建2个函数(createDialog和updateDialog)。我怎样才能做到这一点?在PHP中有非常简单的$$ var。但是如何让变量变量在JS中我不知道。



谢谢

解决方案

像这样:

  actions [key +Dialog] = function(){...} 

但是,由于Javascript函数通过引用捕获变量,您的代码将无法按预期工作。

您需要在一个单独的函数中定义内部函数,以便每个函数都获得一个单独的变量(或参数)。



例如:

  var actionNames = ['create','update']; //这将创建一个包含两个元素的数组
var Dialog = {}; //这会为(var i = 0; i< actionNames.length; i ++){
对话框[actionNames [i]] = createAction(actionNames [i])创建一个空对象

。 );


函数createAction(key){
return function(){...};

$ / code>

您可以像这样使用它:

  Dialog.create(...); 



编辑



您试图污染具有多个对话框相关函数的全局名称空间。

这是一个糟糕的主意;最好把你的函数组织到命名空间中。



如果你真的想要关注全局命名空间,你可以这样做:

  var actionNames = ['create','update']; //这为两个项目创建一个数组

for(var i = 0; i< actionNames.length; i ++){
this [actionNames [i] +'Dialog'] = createAction(actionNames [I]);
}

这会创建一个名为 createDialog updateDialog

在一个普通的函数调用中, this 关键字指的是全局命名空间(通常是窗口对象)。


I have the following code in Javascript:

jQuery(document).ready(function(){
    var actions = new Object();
    var actions;
    actions[0] = 'create';
    actions[1] = 'update';
    for (key in actions) {
        // Dialogs
        var actions[key]+Dialog = function(){
            $('#'+actions[key]+'dialog').dialog('destroy');
            $('#'+actions[key]+'dialog').dialog({
                resizable: false,
                height:600,
                width:400,
                modal: true,
                buttons: {
                    Cancel: function() {
                        $(this).dialog('close');
                    }
                }
            });
        };
    }
});

I want to create 2 functions in loop(createDialog and updateDialog). How can i do this? In PHP there is very simple $$var. But how make variable variable in JS I don't know.

Thank you

解决方案

Like this:

actions[key + "Dialog"] = function () { ... };

However, since Javascript functions capture variables by reference, your code will not work as intended.
You need to define the inner function inside of a separate function so that each one gets a separate key variable (or parameter).

For example:

var actionNames = [ 'create', 'update' ];   //This creates an array with two items
var Dialog = { };    //This creates an empty object

for (var i = 0; i < actionNames.length; i++) {
    Dialog[actionNames[i]] = createAction(actionNames[i]);
}

function createAction(key) {
    return function() { ... };
}

You can use it like this:

Dialog.create(...);

EDIT

You are trying to pollute the global namespace with multiple dialog-related functions.
This is a bad idea; it's better to organize your functions into namespace.

If you really want to polute the global namespace, you can do it like this:

var actionNames = [ 'create', 'update' ];   //This creates an array with two items

for (var i = 0; i < actionNames.length; i++) {
    this[actionNames[i] + 'Dialog'] = createAction(actionNames[i]);
}

This will create to global functions called createDialog and updateDialog.
In a normal function call, the this keyword refers to the global namespace (typically the window object).

这篇关于使用JavaScript变量作为函数名称?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!

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