core-curl/src/lib/jsonp.js

module.exports = ({ url, data }) => {
    return new Promise((resolve) => {
        if (!url)
            throw new Error('url is necessary')
        const callback = 'CALLBACK' + Math.random().toString().substr(9, 18)
        // const callback = 'cb_callback'
        const JSONP = document.createElement('script')
        JSONP.setAttribute('type', 'text/javascript')

        const headEle = document.getElementsByTagName('head')[0]

        let ret = '';
        if (data) {
            if (typeof data === 'string')
                ret = '&' + data;
            else if (typeof data === 'object') {
                for (let key in data)
                    ret += '&' + key + '=' + encodeURIComponent(data[key]);
            }
            ret += '&_time=' + Date.now();
        }
        JSONP.src = `${url}?callback=${callback}${ret}`;

        window[callback] = function (r) {
            resolve(r)
            headEle.removeChild(JSONP)
            delete window[callback]
        }

        headEle.appendChild(JSONP)
    });

}