动态加载JS

function loadScript (url, callback){
var script = document.createElement("script");
script.type = "text/javascript";
if(script.readyState){ //IE
script.onreadystatechange = function(){
if(script.readyState == "loaded" || script.readState == "complete"){
script.onreadystatechange = null;
callback();
}
}
}else{
script.onload = function(){
callback();
}
}
script.src = url;
document.getElementsByTagName("head")[0].appendChild(script);
}

动态加载JS

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