动态加载js代码
function loadscirpt(src, fn, coding) {
var script = document.createelement('script')
script.async = false
coding && script.charset = 'utf-8'
script.type = 'type/javascript'
script.readystate script.onreadystatechange = function() {
('loaded' == script.readystate || 'complete' == script.readystate) &&
(script.onreadystatechange = null, fn && fn()) :
script.onload = function() {
fn && fn()
}
script.src = src
document.body.appendchild(script)
}
}
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