// 源字符串
const str1 = " abc =b\\n  ;c=\\x61d;d=234;t=\\n;d=\"test;yes \";"
// 考虑 Value 内包含 `\"` 或 `=` 的
const str2 = " abc =b\\n  ;c=\\x61d;d=234;t=\\n;d=\"test;yes\";g=\"\";sdsd\""
// 考虑 Value 内包含空格的
const str3 = " abc =b\\n  ;c=\\x61d;d=234;t=\\n;d=\"test;yes\";g=\"\" ; s dsd\""

const decode = function (str) {
    var res = []
    str.match(/(\w+[\s]*=((\".*?\")|(.*?));)/g).map(_item=>{
        let item = _item.replace(/\s+/g, '').replace(/;$/, '')
        // console.log(item)
        let K = item.split('=')[0]
        let V = item.split('=')[1]
        res[K] = V
    })
    return res
}
console.log(decode(str1)) // [ abc: 'b\\n', c: '\\x61d', d: '"test;yes"', t: '\\n' ]
// console.log(decode(str2))
// console.log(decode(str3))