Javascript文字对象,对其自身的引用 [英] Javascript literal object, reference to itself
本文介绍了Javascript文字对象,对其自身的引用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下示例代码:
var foo = {
self: this,
init: function(){
self.doStuff();
},
doStuff: function(){
alert('doing stuff');
}
}
foo.init();
为什么引用自我"不起作用?
Why the refence "self" doesn't work?
谢谢!
推荐答案
跟随Qeuntin的回复,您将使用以下内容来实现所需的功能
Following up on Qeuntin's response you would use the following to achieve what you're looking for
var foo = {
self: false,
init: function(){
self = this
self.doStuff();
},
doStuff: function(){
alert('doing stuff');
},
}
既然已经指出,尽管这解决了OP的问题(即,它可以工作),但这并不是您应该怎么做.因此,这是一个范围界定参考.
Since it's been pointed out that whilst this solves OP's problem (i.e it works) it isn't exactly how you should go about it. So, here's a scoping reference.
function A()
{
//Semi-private / hidden var
var pVar = "I'm a private, err hidden, variable",
//fn (technically a var)
pFn = function(){},
//empty var, placholder for hidden fn
privatePlaceholderFn;
//Instance-time... public fn
this.instancePublicFn = function()
{
console.log("--- instace public ---");
//Print hidden var to cosole
console.log(pVar);
//Call hidden fn
instancePrivateFn();
console.log("--->Setting private from instance public")
//Set the hidden fn
setPrivate();
console.log("--- / instance public ---");
}
//Pass fn to private method.
this.setPrivFromOutside = function(fn)
{
setPrivateFromPrivateYetOutside(fn);
}
//Set the hidden fn
this.iPFnPlaceholderSetter = function(fn)
{
privatePlaceholderFn = fn;
}
//Call the semi-private / hidden fn
this.callPrivate = function()
{
privatePlaceholderFn();
}
//A misnomer, proves the scope exists. See "function setPrivate()"
this.setPrivateFromInstance = function()
{
//Prove scope exists
console.log(privatePlaceholderFn);
console.log("Private From instance - gets inside scope");
}
//Set hidden fn from private method
function setPrivate()
{
privatePlaceholderFn = function()
{
//Show scope exists
console.log(pVar);
}
}
//Set the hidden fn from hidden method
function setPrivateFromPrivateYetOutside(fn)
{
//fn's scope won't resolve to inside
privatePlaceholderFn = fn;
}
//Private / hidden messager
function instancePrivateFn()
{
//Just loggin' something
console.log("Instance Private method");
}
}
//Add an object method to the prototype
A.prototype.protoPuFn = function(){
console.log("---> Private var from object literal method");
//console.log(pVar)
}
//...
a = new A();
//Add object literal fn
a.objFn = function()
{
console.log("Object literal defined public fn - Gets outside scope");
//console.log(pVar);
}
//Set private / hidden placeholder fn
a.iPFnPlaceholderSetter(function()
{
console.log("Hidden fn, passed through instance public - gets outside scope");
//console.log(pVar);
});
//Attempt to read hidden var
console.log(a.pVar);
//Call object literal defined fn
a.objFn();
//Call the hidden fn
a.callPrivate();
//Call prototype added fn
a.protoPuFn();
//Call instance added public fn
a.instancePublicFn();
//Call private / hidden method (set
a.callPrivate();
//Same as iPFnPlaceholderSetter except the param is passed to a hidden method, before seting.
a.setPrivFromOutside(function()
{
console.log("-->Passed from outside, through public then private setters");
//console.log(pVar)
})
//Call the hidden method
a.callPrivate();
//Set hidden fn from instance public
a.setPrivateFromInstance();
//Call the hidden method.
a.callPrivate();
//Use evi(a)l fn to steal scope.
a.evil("this.meth = function(){console.log(pVar)}");
//Call fn with stolen scope
a.meth();
这篇关于Javascript文字对象,对其自身的引用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!
查看全文