自己封装的JSONP请求，如何异常处理
自己封装的JSONP异常处理，原理还是利用超时
var JSONP = (function () {
var counter = 0,
head, query, key, window = this;
function load(url) {
var script = document.createElement('script'),
var done = false;
script.src = url;
script.async = true;
script.onload = script.onreadystatechange = function () {
if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete")) {
done = true;
script.onload = script.onreadystatechange = null;
if (script && script.parentNode) {
script.parentNode.removeChild(script);
}
}
};
if (!head) {
head = document.getElementsByTagName('head')
;
}
head.appendChild(script);
}
function jsonp(url, params, error, callback) {
query = "?";
params = params || {};
for (key in params) {
if (params.hasOwnProperty(key)) {
query += encodeURIComponent(key) + "=" + encodeURIComponent(params[key]) + "&";
}
}
var jsonp = "json" + (++counter);
window[jsonp] = function (data) {
callback(data);
try {
delete window[jsonp];
} catch (e) {}
window[jsonp] = null;
};
load(url + query + "callback=" + jsonp);
error = error ||
function () {};
window.setTimeout(function () {
if (typeof window[jsonp] == "function") {
// replace success with null callback in case the request is just very latent.
window[jsonp] = function (data) {
try {
delete window[jsonp];
} catch (e) {}
window[jsonp] = null;
};
// call the error callback
error();
// set a longer timeout to safely clean up the unused callback.
window.setTimeout(function () {
if (typeof window[jsonp] == "function") {
try {
delete window[jsonp];
} catch (e) {}
window[jsonp] = null;
};
}, 120000);
};
}, 10000);
return jsonp;
}
return {
get: jsonp
};
}());
/*
Example:
----------------
var url = 'http://blog.eood.cn/api';
var error = function() {alert('error');};
var success = function(data) {
// process the data
};
JSONP.get( url, {'parm1': 'parm1_value', 'parm2': 'parm2_value'}, error, success);
*/
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