MD5算法参考
另外可能存在的问题:似乎没有测试中文(utf8编码)

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const MD5 = hex_md5 // http://pajhome.org.uk/crypt/md5/md5.html

const openid = 'oUpF8EMuAJO_M2Xxb1Q3zNjWeS33'

const params = {
appid: "wxd9309a5d2a258f31",
mch_id: "10000100",
device_info: "WEB",
body: "JSAPI支付测试",
notify_url: 'httts://www.google.com/',
openid: openid,
out_trade_no: '100000000001',
spbill_create_ip: '111.194.196.105',
total_fee: '1',
trade_type: 'JSAPI',
nonce_str: getNonceStr(),
}

const body = genRequstBody(params)
console.log(body)

// ----------- genRequstBody
function genRequstBody(params) {
const stringA = Object.keys(params).sort().map(k => {
return k + '=' + params[k]
}).join('&')

console.log(stringA)

const stringSignTemp=stringA+"&key=192006250b4c09247ec02edce69f6a2d" //注:key为商户平台设置的密钥key
const sign = MD5(stringSignTemp).toUpperCase() // ="9A0A8659F005D6984697E2CA0A9CF3B7" //注:MD5签名方式

console.log(sign)

let body = Object.keys(params).sort().map(k => {
return '<' + k + '>' + params[k] + '</' + k + '>'
}).join('\n')
body += '\n<sign>' + sign + '</sign>\n'
const xml = '<xml>\n' + body + '</xml>'
return xml
}

// ----------- nonce_str
function makeid(length) {
var result = '';
var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var charactersLength = characters.length;
for ( var i = 0; i < length; i++ ) {
result += characters.charAt(Math.floor(Math.random() * charactersLength));
}
return result;
}

function getNonceStr() {
return makeid(31)
}