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module.exports = function load (src, opts, cb) {
var head = document.head || document.getElementsByTagName('head')[0]
var script = document.createElement('script')
if (typeof opts === 'function') {
cb = opts
opts = {}
}
opts = opts || {}
cb = cb || function() {}
script.type = opts.type || 'text/javascript'
script.charset = opts.charset || 'utf8';
script.async = 'async' in opts ? !!opts.async : true
script.src = src
if (opts.attrs) {
setAttributes(script, opts.attrs)
}
if (opts.text) {
script.text = '' + opts.text
}
var onend = 'onload' in script ? stdOnEnd : ieOnEnd
onend(script, cb)
// some good legacy browsers (firefox) fail the 'in' detection above
// so as a fallback we always set onload
// old IE will ignore this and new IE will set onload
if (!script.onload) {
stdOnEnd(script, cb);
}
head.appendChild(script)
}
function setAttributes(script, attrs) {
for (var attr in attrs) {
script.setAttribute(attr, attrs[attr]);
}
}
function stdOnEnd (script, cb) {
script.onload = function () {
this.onerror = this.onload = null
cb(null, script)
}
script.onerror = function () {
// this.onload = null here is necessary
// because even IE9 works not like others
this.onerror = this.onload = null
cb(new Error('Failed to load ' + this.src), script)
}
}
function ieOnEnd (script, cb) {
script.onreadystatechange = function () {
if (this.readyState != 'complete' && this.readyState != 'loaded') return
this.onreadystatechange = null
cb(null, script) // there is no way to catch loading errors in IE8
}
}
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