10 examples of 'javascript load url' in JavaScript

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

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function LoadScript( url )
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{
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 document.write( '<\/scr' + 'ipt>' ) ;        
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}

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function LoadScript( url )
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{
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 document.write( '<\/scr' + 'ipt>' ) ;        
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}

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function LoadScript( url )
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{
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 document.write( '<\/scr' + 'ipt>' ) ;        
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}

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

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function loadJS(url, isExternal)
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{
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	if( isExternal )
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		url = document.location.protocol == 'file:' ? 'http:' + url : url;
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	else
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		url += '?v=' + app.version + (!app.isProduction ? '&_=' + new Date().getTime() : '');
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	var ref = window.document.getElementsByTagName('script')[0];
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	var script = window.document.createElement('script');
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	script.src = url;
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	script.async = false;
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	ref.parentNode.insertBefore(script, ref);
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}

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

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export function loadScript(url, callback) {
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    if (isNodeEnv()) {
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        return
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    }
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    var head = document.getElementsByTagName('head')[0];
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    var script = document.createElement('script');
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    script.type = 'text/javascript';
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    script.src = url;
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    //借鉴了jQuery的script跨域方法
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    script.onload = script.onreadystatechange = function(){
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        if((!this.readyState||this.readyState === 'loaded'||this.readyState === 'complete')){
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            callback && callback();
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            // Handle memory leak in IE
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            script.onload = script.onreadystatechange = null;
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        }
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    };
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    head.appendChild(script);
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}

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function loadScript(url, callback)
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{
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    // Adding the script tag to the head as suggested before
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    var head = document.getElementsByTagName('head')[0];
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    var script = document.createElement('script');
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    script.type = 'text/javascript';
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    script.src = url;
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    // Then bind the event to the callback function.
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    // There are several events for cross browser compatibility.
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    script.onreadystatechange = callback;
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    script.onload = callback;
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    // Fire the loading
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    head.appendChild(script);
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}

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function loadScript(url) {
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  var script = document.createElement('script');
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  script.src = url;
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  var firstScript = document.getElementsByTagName('script')[0];
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  firstScript.parentNode.insertBefore(script, firstScript);
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}