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Possible Duplicates:
How can I unset a JavaScript variable?
How do I remove a property from a JavaScript object?

I m looking for a way to remove/unset the properties of a JavaScript object, so they ll no longer come up if I loop through the object doing for (var i in myObject). How can this be done?

Answer 1

简略使用<代码>delete,但应认识到,你应读出使用这一条的效果:

 delete object.index; //true
 object.index; //undefined

But if I was to use like so:

var x = 1; //1
delete x; //false
x; //1

但是,如果你确实希望删除全球名称空间中的变量,你可以将其全球目标,例如<代码>window<>/code>,或在最外部使用<代码>ts,即

var a =  b ;
delete a; //false
delete window.a; //true
delete this.a; //true

<http://perfectionrics.com/underont-delete/"rel=“noretinger”> 删除。

另一个事实是,删除阵列不会删除该指数,而只是确定某些控制结构,例如就 lo而言,其价值是未界定的。当涉及阵列时,你应使用<代码> plice,这是阵列标的原型。

例:

var myCars = new Array();
myCars[0] = "Saab";
myCars[1] = "Volvo";
myCars[2] = "BMW";

如果是:

delete myCars[1];

由此产生的阵列如下:

["Saab", undefined, "BMW"]

但使用ice像

myCars.splice(1,1);

结果是:

["Saab", "BMW"]

Answer 2

空白:

myObject["myVar"]=null;

删除:

delete myObject["myVar"]

你可以重复回答

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