什么是>>>操作员? [英] What's the >>> operator?

问题描述

在Mozilla网站的filter文档页面中，我看到了>>>运算符:

In filter documentation page in Mozilla website, I saw >>> operator:

var t = Object(this),
     len = t.length >>> 0, //here
     res, thisp, i, val;
if (typeof fun !== 'function') {
    throw new TypeError();
}

在这里您可以找到完整的文档: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Here you can find the complete document: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

这个运算符是什么及其作用?

What's this operator and what it does?

推荐答案

这是一个移位运算符.

来自 https://developer.mozilla.org/en -US/docs/Web/JavaScript/Guide/Expressions_and_Operators ，

a >>> b将二进制表示形式的a右移b位，丢弃偏移的位，并从左移零.

a >>> b shifts a in binary representation b bits to the right, discarding bits shifted off, and shifting in zeros from the left.

但是，这并不能解释为什么有人会不愿意将值右移零位.您也可以将其乘以1或加零.

That doesn't explain why anyone would bother to shift a value zero bits to the right, though. You might as well multiply it by one, or add zero.

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