问题描述
根据，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。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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