javascript 删除全局变量
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remove global variable
提问by Ido Tamir
采纳答案by usoban
Since second parameter to scheduleis context object and you pass globalto it, you could write the function as
由于第二个参数 toschedule是上下文对象并且您传递global给它，因此您可以将函数编写为
function up(){
var pos = this.getPosition();
pos += 2;
this.setPosition(pos);
}
If that is really what you're asking for.
如果这真的是你所要求的。
If you only need to delete the variable, you can set it to null. Operator deleteis intended for deleting object properties, not unsetting variables.
如果只需要删除变量，可以设置为null。运算符delete旨在删除对象属性，而不是取消设置变量。
回答by hvgotcodes
you can always delete a property on an object like so (note that global variables are really on window, at least in browser javascript)
您总是可以像这样删除对象上的属性（请注意，全局变量确实是 on window，至少在浏览器 javascript 中）
delete window.global;
delete window.global;
if you then try to access your variable, you will get a Reference error. Be careful, because if your schedulecall invokes the method later, and it depends on global, it will be gone. Might be better just to use a local variable (with var)
如果您随后尝试访问您的变量，您将收到一个引用错误。小心，因为如果你的schedule调用稍后调用该方法，并且它依赖于全局，它就会消失。仅使用局部变量可能会更好（使用var）
回答by josh3736
If you're not referencing that function anywhere else, why not just:
如果您没有在其他任何地方引用该函数，为什么不只是：
lime.scheduleManager.schedule(function (){
var pos = global.getPosition();
pos.x += 2;
global.setPosition(pos);
}, global);
回答by Juan Mendes
If you mean mark it so it can be garbage collected, you can just set the reference to null. If there are no other references, the object will be gc'd next time the gc kicks in.
如果你的意思是标记它以便它可以被垃圾收集，你可以将引用设置为空。如果没有其他引用，该对象将在下次 gc 启动时被 gc。
回答by jtfairbank
In regular javascript it would be:
在常规 javascript 中，它将是：
delete global.myVar
or
或者
delete pos
Not 100% sure if this will work in limejs (never used it) but worth a try.
不能 100% 确定这是否适用于limejs（从未使用过），但值得一试。
