在Javascript中减少IF语句中的多个OR [英] Reduce multiple ORs in IF statement in Javascript
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问题描述
有没有更简单的方法在JavaScript中重写以下条件?
Is there a simpler way to rewrite the following condition in JavaScript?
if ((x == 1) || (x == 3) || (x == 4) || (x == 17) || (x == 80)) {...}
推荐答案
您可以使用有效值数组并使用 indexOf
:
You could use an array of valid values and test it with indexOf
:
if ([1, 3, 4, 17, 80].indexOf(x) != -1)
编辑请注意 indexOf
刚刚在ECMAScript 5中添加,因此并未在每个浏览器中实现。但您可以使用以下代码添加它缺失:
Edit Note that indexOf
was just added in ECMAScript 5 and thus is not implemented in every browser. But you can use the following code to add it if missing:
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt /*, from*/)
{
var len = this.length >>> 0;
var from = Number(arguments[1]) || 0;
from = (from < 0)
? Math.ceil(from)
: Math.floor(from);
if (from < 0)
from += len;
for (; from < len; from++)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
}
或者,如果你已经在使用JavaScript框架,你也可以使用它的实现方法。
Or, if you’re already using a JavaScript framework, you can also use its implementation of that method.
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