/
index.js
53 lines (41 loc) · 1.2 KB
/
index.js
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var once = require('once')
module.exports = scriptLoad
function scriptLoad(url, callback) {
callback = once(callback || throwup)
var script = document.createElement('script')
script.type = 'text/javascript'
script.charset = 'utf-8'
script.async = true
if (script.attachEvent) {
script.attachEvent('onreadystatechange', loaded)
} else {
script.addEventListener('load', loaded, false)
script.addEventListener('error', error, false)
}
script.src = url
document.body.appendChild(script)
function loaded(event) {
if (event.type !== 'load' && !/^(ready|complete)$/g.test(
(event.currentTarget || event.srcElement).readyState
)) return
if (script.removeEventListener) {
script.removeEventListener('load', loaded, false)
} else {
script.detatchEvent('onreadystatechange', loaded)
}
callback(null, script)
}
function error(event) {
script.removeEventListener('error', error, false)
return callback(
new Error('Script "' + shorten(url) + '" did not load successfully')
, script
)
}
}
function shorten(str) {
return str.length > 120 ? str.slice(0, 120) + '...' : str
}
function throwup(err) {
if (err) throw err
}