inarray()，如何正确使用它?

First time I work with jQuery.inArray() and it acts kinda strange.

第一次使用jQuery.inArray()时，它的行为有点奇怪。

If the object is in the array, it will return 0, but 0 is false in Javascript. So the following will output: "is NOT in array"

如果对象在数组中，它将返回0，但是在Javascript中0是错误的。下面将输出"is NOT in array"

var myarray = [];
myarray.push("test");

if(jQuery.inArray("test", myarray)) {
    console.log("is in array");
} else {
    console.log("is NOT in array");
}

I will have to change the if statement to:

我必须将if语句改为:

if(jQuery.inArray("test", myarray)==0)

But this makes the code unreadable. Especially for someone who doesn't know this function. They will expect that jQuery.inArray("test", myarray) gives true when "test" is in the array.

但这使得代码不可读。特别是对于那些不知道这个函数的人。他们会期待jQuery。inArray(“test”，myarray)在数组中显示“test”。

So my question is, why is it done this way? I realy dislike this. But there must be a good reason to do it like that.

我的问题是，为什么要这样做?我真的不喜欢这样。但这样做一定有很好的理由。

15 个解决方案

#1

524

inArray returns the index of the element in the array, not a boolean indicating if the item exists in the array. If the element was not found, -1 will be returned.

inArray返回数组中元素的索引，而不是指示数组中是否存在项的布尔值。如果没有找到元素，将返回-1。

So, to check if an item is in the array, use:

因此，要检查数组中是否有项，请使用:

if(jQuery.inArray("test", myarray) !== -1)

15 个解决方案

#1

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