在JavaScript中，整数如何在存储布局中表示? [英] In JavaScript, how is integer represented in storage layout?

问题描述

JavaScript为所有数字文字提供64位浮点数，并且存储布局和范围受

JavaScript comes with 64bit float numbers for all numeric literals, and the storage layout and range is regulated under ITEE 754.

另一方面，我了解到浮点数的范围为±〜10 ^ -323.3至〜10 ^ 308.3，并且具有尽可能可靠的精度.整数的范围为-2 ^ 53-2 ^ 53，并且精度可靠.

On the other hand, I learned that the float has a range of ± ~10^-323.3 to ~10^308.3 and an as-reliable-as-possible precision. Integer has a range of -2^53 - 2^53 and a reliable precision.

ITEE 754解释了浮点数的行为，但是我对JS中的整数感到困惑.如何从64位数据格式生成精度范围?

ITEE 754 explains the behavior of float numbers but I get confused about the integer in JS. How is the range of precision generated from the 64bit data format?

[已解决] 该值存储在分数位置. 1 is (1+0)*2^0，2 is (1 + 0) * 2^1，3 is (1 + 2^-1)*2^1 ... -2 ^ 53和2 ^ 53之间的任何数字都可以精确表示. 由于所有分数都有前导1，因此范围是-2 ^ 53至2 ^ 53

[Solved] The value is stored in the fraction position. 1 is (1+0)*2^0, 2 is (1 + 0) * 2^1, 3 is (1 + 2^-1)*2^1... Any number between -2^53 and 2^53 could be expressed precisely. As there is a leading 1 for all fraction, the range is -2^53 to 2^53

推荐答案

[解决了我自己]，该值存储在分数位置. 1是(1 + 0)* 2 ^ 0，2是(1 + 0)* 2 ^ 1，3是(1 + 2 ^ -1)* 2 ^ 1 ... -2 ^ 53和2之间的任何数字^ 53可以精确表达.由于所有分数都有前导1，因此范围是-2 ^ 53至2 ^ 53

[Solved myself] The value is stored in the fraction position. 1 is (1+0)*2^0, 2 is (1 + 0) * 2^1, 3 is (1 + 2^-1)*2^1... Any number between -2^53 and 2^53 could be expressed precisely. As there is a leading 1 for all fraction, the range is -2^53 to 2^53

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