95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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/**
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* Created by lizq on 2017/8/7
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*/
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// Callback index.
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var count = 0;
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/**
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* JSONP handler
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*
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* Options:
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* - prefix {String} callback prefix (defaults to `__jp`)
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* - callback {String} (defaults to `callback`)
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* - timeout {Number} how long after the request until a timeout error
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* is emitted (defaults to `15000`)
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*/
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function jsonp(url, options) {
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options = options || {};
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var prefix = options.prefix || '__jp';
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var callback = options.callback || 'callback';
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var callbackName = options.callbackName;
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var params = options.data || {};
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var timeout = options.timeout ? options.timeout : 15000;
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var target = document.getElementsByTagName('script')[0] || document.head;
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var script = void 0;
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var timer = void 0;
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var promise = void 0;
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// Generate a unique id for the request.
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var id = callbackName || prefix + count++;
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function noop() {}
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function cleanup() {
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// Remove the script tag.
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if (script && script.parentNode) {
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script.parentNode.removeChild(script);
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}
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window[id] = noop;
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if (timer) {
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clearTimeout(timer);
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}
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}
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function serialize(params) {
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var param = '';
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for (var key in params) {
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if (params.hasOwnProperty(key)) {
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param += '&' + key + '=' + encodeURIComponent(params[key]);
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}
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}
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return param;
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}
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function handleUrl(url, params) {
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if (!~url.indexOf('?')) {
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url += '?';
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}
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url += serialize(params);
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url = url.replace('?&', '?');
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return url;
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}
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promise = new Promise(function (resolve, reject) {
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if (timeout) {
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timer = setTimeout(function () {
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cleanup();
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reject(new Error('Timeout'));
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}, timeout);
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}
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window[id] = function (data) {
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cleanup();
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resolve(data);
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};
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if (!callbackName) {
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params[callback] = id;
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}
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url = handleUrl(url, params);
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// Create script.
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script = document.createElement('script');
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script.src = url;
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script.onerror = function () {
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cleanup();
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reject(new Error('Network Error'));
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};
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target.parentNode.insertBefore(script, target);
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});
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return promise;
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}
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exports.default = jsonp; |