从内存中删除HTML元素（DOM节点） [英] Remove HTML element (DOM Node) from memory

问题描述

根据 mdn文档，方法 removeChild 从DOM中删除一个节点，但它仍然驻留在内存中。
我的问题是我想从内存中删除它。
我尝试使用删除运算符，但对象仍然存在...

according to mdn documentation the method removeChild removes a node from the DOM but it still resides in memory. My problem is that I want to delete it from memory as well. I've tried with the delete operator but the object is still there...

myCanvas.parentElement.removeChild(myCanvas);  // myCanvas actually removed from DOM
delete myCanvas;  // false. does nothing
alert(myCanvas); // shows HTMLCanvasElement instead of undefined

推荐答案

阅读 http://perfectionkills.com/understanding-delete/ 。删除操作符不适用于变量（这就是为什么它返回 false ）。

Read http://perfectionkills.com/understanding-delete/. The delete operator is not for variables (that's why it returns false).

如果要删除变量引用DOM节点，使用

If you want to remove the variable's reference to the DOM node, use

myCanvas = null;

覆盖该值。通常你不需要这样做，因为JS的垃圾收集器为你做的所有工作。

to overwrite the value. Usually you never need to do this, because the garbage collector of JS does all the work for you.

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