检查编号是否在目标编号范围内

Question

我想查看一个数字是否在目标数字的4之内。

目前我通过以下方式执行此操作：

DEMO：https://jsfiddle.net/o0b99yys/

var targetNum = 32;
var newNum = 31;

if ((newNum > (targetNum + 4)) || (newNum < (targetNum - 4))) {
  alert('Error: number must be within 4 or target');
} else {
  alert('Success: number is within 4 or target');
}

这似乎有点业余。有更清洁，更专业的方式吗？

Answer 1

此解决方案看起来更好：

var targetNum = 32;
var newNum = 31;

if (Math.abs(targetNum - newNum) > 4) {
  alert('Error: number must be within 4 or target');
} else {
  alert('Success: number is within 4 or target');
}

Answer 2

＆＃13;

＆＃13;

    var targetNum = 32,
        newNum = 31,
        target_range_max = targetNum + 4,
        target_range_min = targetNum - 4;

    if ( target_range_min <= newNum && newNum <= target_range_max ) {
     alert('Success: number is within 4 or target');
    } else {
     alert('Error: number must be within 4 or target');
    }

＆＃13;

＆＃13;

＆＃13;

Answer 3

如果您想要对该表达式进行简化版本，请尝试此操作：

＆＃13;

＆＃13;

var myNum = 32;
var newNum = 31;

Math.abs(myNum-newNum)>4 ? alert('Error: number must be within 4 or target') : alert('Success: number is within 4 or target');

＆＃13;

＆＃13;

＆＃13;