`if（condition = value）`是正确的比较语法吗？ [英] Is `if (condition = value)` the correct syntax for comparison?

问题描述

如果 if（（hit.transform！= transform）表示如果hit.transform为Not transform ，则如何检查语句是否正确。 if（hit.transform = transform）似乎不起作用。

If if((hit.transform != transform) means if hit.transform is Not transform, then how do I check if the statement Is correct. if(hit.transform = transform) doesn't seem to work.

推荐答案

你需要两个相等的符号表示平等

You need two equals signs for equality

if (hit.transform == transform)

请注意，这将允许各种隐式转换，因此您应该使用三个等于标志 - 身份平等或严格平等：

Note that that will allow all sorts of implicit conversions, so you should really use three equals signs—identity equality or strict equality:

if (hit.transform === transform)

请注意，单个等号是分配。

Note that a single equals sign is assignment.

x = y;

现在x的值为y。

您的陈述

if(hit.transform = transform)

将hit.transform分配给transform的值，然后测试以查看此e的结果xpression，与hit.transform的新值相同，是truthy

Assigns hit.transform to the value of transform, then tests to see if the result of this expression, which will be the same as hit.transform's new value, is "truthy"

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