What does 'this.x1 = options.x1

2018-07-04 05:13:19

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Was reading some code and I saw this:

this.x1 = options.x1 || 0;

Never seen syntax like this before. What does it mean?

这是一个合并......这意味着如果options.x1是虚假的，它将分配0，否则就是options.x1。

Let this.x1 be the value of options.x1 if options.x1 has any truthy value. Otherwise let this.x1 be 0 .

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