javascript - 为什么（0 <5 <3）返回true？(Why does (0 < 5 < 3) return true?)

Question

I was playing around in jsfiddle.net and I'm curious as to why this returns true?(我在jsfiddle.net上玩，我很好奇为什么这会返回true？)

if(0 < 5 < 3) {
    alert("True");
}

So does this:(这样做：)

if(0 < 5 < 2) {
    alert("True");
}

But this doesn't:(但这不是：)

if(0 < 5 < 1) {
    alert("True");
}

Is this quirk ever useful?(这个怪癖是否有用？)

  ask by punkrockbuddyholly translate from so

Answer 1

Order of operations causes (0 < 5 < 3) to be interpreted in javascript as ((0 < 5) < 3) which produces (true < 3) and true is counted as 1, causing it to return true.(操作顺序导致(0 < 5 < 3)在javascript中被解释为((0 < 5) < 3)其产生(true < 3)并且true被计为1，从而使其返回true。)

This is also why (0 < 5 < 1) returns false, (0 < 5) returns true, which is interpreted as 1 , resulting in (1 < 1) .(这也是为什么(0 < 5 < 1)返回false， (0 < 5)返回true，这被解释为1 ，导致(1 < 1) 。)