JavaScript 的 array.clear() 不是函数吗？

Is JavaScript's array.clear() not a function?

提问by Nona Urbiz

I'm trying to empty an array containing my drawn coordinates when a button "clear" is pressed.

当按下“清除”按钮时，我试图清空一个包含我绘制坐标的数组。

When I call drawnDivs.clear(), I get an error that it is not a function. drawnDivsis certainly an array, and I have Firebugconsole.logs printing things out. It's hosted here.

当我调用 时drawnDivs.clear()，我收到一个错误，指出它不是一个函数。drawnDivs肯定是一个数组，我有Firebugconsole.log打印出来的东西。它在这里托管。

回答by jordanbtucker

Nope, it's not. But drawnDivs.length = 0should work.

不，不是。但drawnDivs.length = 0应该工作。

回答by Mike Ruhlin

drawnDivs = [];

绘制的Divs = [];

回答by subhaze

It was answered in Stack Overflow question How do I empty an array in JavaScript?.

在 Stack Overflow 问题中回答了如何在 JavaScript 中清空数组？.

Two examples from the answer:

答案中的两个例子：

var A = ['some', 'values', 'here'];

//Method 1

//(This was my original answer to the question)

A = [];




// Method 2 (as suggested by Matthew Crumley)

A.length = 0

And here is a nice write upon these two methods by Dr. Axel Rauschmayer.

而这里是一个很好的写了这两种方法属于Axel Rauschmayer先生博士。

回答by user3271659

An optimized way to do it is:

一个优化的方法是：

while (arr.pop()) {}

See http://jsperf.com/kbk-clear-array/2.

请参阅http://jsperf.com/kbk-clear-array/2。

回答by Debosmit Ray

You could alternately use the Prototype library and then, use Prototype's clear()method.

您可以交替使用 Prototype 库，然后使用 Prototype 的clear()方法。