比较不同条件下的功能:

const compareVer = (ver1, middle, ver2) => {
  const res = new Intl.Collator("en").compare(ver1, ver2)
  let comp

  switch (middle) {
    case "=":
      comp = 0 === res
      break

    case ">":
      comp = 1 === res
      break

    case ">=":
      comp = 1 === res || 0 === res
      break

    case "<":
      comp = -1 === res
      break

    case "<=":
      comp = -1 === res || 0 === res
      break
  }

  return comp
}

console.log(compareVer("1.0.2", "=", "1.0.2")) // true
console.log(compareVer("1.0.3", ">", "1.0.2")) // true
console.log(compareVer("1.0.1", ">=", "1.0.2")) // false
console.log(compareVer("1.0.3", ">=", "1.0.2")) // true
console.log(compareVer("1.0.1", "<", "1.0.2")) // true
console.log(compareVer("1.0.1", "<=", "1.0.2")) // true

这是一个巧妙的技巧。如果您正在处理数值，在特定的值范围内，您可以为版本对象的每个级别分配一个值。例如，“largestValue”在这里被设置为0xFF，这为您的版本控制创建了一个非常“IP”的外观。

这也处理字母-数字版本(即1.2a < 1.2b)

// The version compare function
function compareVersion(data0, data1, levels) {
    function getVersionHash(version) {
        var value = 0;
        version = version.split(".").map(function (a) {
            var n = parseInt(a);
            var letter = a.replace(n, "");
            if (letter) {
                return n + letter[0].charCodeAt() / 0xFF;
            } else {
                return n;
            }
        });
        for (var i = 0; i < version.length; ++i) {
            if (levels === i) break;
            value += version[i] / 0xFF * Math.pow(0xFF, levels - i + 1);
        }
        return value;
    };
    var v1 = getVersionHash(data0);
    var v2 = getVersionHash(data1);
    return v1 === v2 ? -1 : v1 > v2 ? 0 : 1;
};
// Returns 0 or 1, correlating to input A and input B
// Direct match returns -1
var version = compareVersion("1.254.253", "1.254.253a", 3);

一个非常简单的方法:

function compareVer(previousVersion, currentVersion) {
 try {
    const [prevMajor, prevMinor = 0, prevPatch = 0] = previousVersion.split('.').map(Number);
    const [curMajor, curMinor = 0, curPatch = 0] = currentVersion.split('.').map(Number);

    if (curMajor > prevMajor) {
      return 'major update';
    }
    if (curMajor < prevMajor) {
      return 'major downgrade';
    }
    if (curMinor > prevMinor) {
      return 'minor update';
    }
    if (curMinor < prevMinor) {
      return 'minor downgrade';
    }
    if (curPatch > prevPatch) {
      return 'patch update';
    }
    if (curPatch < prevPatch) {
      return 'patch downgrade';
    }
    return 'same version';
  } catch (e) {
    return 'invalid format';
  }
}

输出:

compareVer("3.1", "3.1.1") // patch update
compareVer("3.1.1", "3.2") // minor update
compareVer("2.1.1", "1.1.1") // major downgrade
compareVer("1.1.1", "1.1.1") // same version

2017答:

v1 = '20.0.12'; 
v2 = '3.123.12';

compareVersions(v1,v2) 
// return positive: v1 > v2, zero:v1 == v2, negative: v1 < v2 
function compareVersions(v1, v2) {
        v1= v1.split('.')
        v2= v2.split('.')
        var len = Math.max(v1.length,v2.length)
        /*default is true*/
        for( let i=0; i < len; i++)
            v1 = Number(v1[i] || 0);
            v2 = Number(v2[i] || 0);
            if (v1 !== v2) return v1 - v2 ;
            i++;
        }
        return 0;
    }

最简单的现代浏览器代码:

 function compareVersion2(ver1, ver2) {
      ver1 = ver1.split('.').map( s => s.padStart(10) ).join('.');
      ver2 = ver2.split('.').map( s => s.padStart(10) ).join('.');
      return ver1 <= ver2;
 }

这里的想法是比较数字，但以字符串的形式。为了使比较工作，两个字符串必须在相同的长度。所以:

"123" > "99"变成"123" > "099" 填充短数字“修复”比较

这里我用0填充每个部分，长度为10。然后使用简单的字符串比较来得到答案

例子:

var ver1 = '0.2.10', ver2=`0.10.2`
//become 
ver1 = '0000000000.0000000002.0000000010'
ver2 = '0000000000.0000000010.0000000002'
// then it easy to see that
ver1 <= ver2 // true

const compareAppVersions = (firstVersion, secondVersion) => { const firstVersionArray = firstVersion.split(".").map(Number); const secondVersionArray = secondVersion.split(".").map(Number); const loopLength = Math.max( firstVersionArray.length, secondVersionArray.length ）; 对于(设I = 0;i < loopLength;+ + i) { const a = firstVersionArray[i] || 0; const b = secondVersionArray[i] || 0; If (a !== b) { 返回> b ?1: -1; ｝ ｝ 返回0; };

如果两个版本相等，函数将返回-1，如果第一个版本是最新版本，则返回0，而1表示第二个版本是最新版本。

let v1 = '12.0.1.0'
let v2 = '12.0.1'

let temp1 = v1.split('.');
let temp2 = v2.split('.');

console.log(compareVersion(temp1, temp2))


function compareVersion(version1, version2) {
    let flag = false;
    var compareResult;
    let maxLength = Math.max(version1.length, version2.length); 
    let minLength = Math.min(version1.length, version2.length);

    for (let i = 0; i < maxLength; ++i ) {
        let result = version1[i] - version2[i];
        if (result > 0) {
            flag = true;
            compareResult = 0;
            break;
        }
        else if (result < 0) {
            flag = true;
            compareResult = 1;
            break;
        }

        if (i === minLength) {
            if (version1.length > version1.length) {
                compareResult = version1[version1.length-1] > 0 ? '0' : '-1'
            }  else  {
                compareResult = version1[version2.length-1] > 0 ? '1' : '-1'
            }
            break;
        }
    }
    if (flag === false) {
        compareResult = -1;
    }
    return compareResult;
}