javascript筆記--（第二十三章）動態(tài)加載腳本和樣式

2024-04-27 15:13:48

字體：大中小

供稿：網(wǎng)友

動態(tài)腳本

動態(tài)加載js

<script type="text/javascript">	var flag = true;//設(shè)置true再加載	if (flag) {		loadScript('test.js');//設(shè)置加載的js	}	function loadScript(url) {		var script = document.createElement('script');		script.type = 'text/Javascript';		script.src = url;		//document.head.appendChild(script);//document.head表示<head>	document.getElementsByTagName('head')[0].appendChild(script);	}</script>動態(tài)執(zhí)行js<script type="text/javascript">	var script = document.createElement('script');	script.type = 'text/javascript';	var text = document.createTextNode("alert('Lee')");	//script.appendChild(text);//IE瀏覽器會報錯,兼容用下面的語句	script.text = "alert('hehe')"	document.getElementsByTagName('head')[0].appendChild(script);</script>動態(tài)樣式
樣式表有兩種方式進行加載，一種是<link>標簽，一種是<style>標簽。動態(tài)執(zhí)行l(wèi)ink
<script type="text/javascript">	var flag = true;	if (flag) {		loadStyles('basic.CSS');	}	function loadStyles(url) {		var link = document.createElement('link');		link.rel = 'stylesheet';		link.type = 'text/css';		link.href = url;		document.getElementsByTagName('head')[0].appendChild(link);	}</script>動態(tài)執(zhí)行style
<script type="text/javascript">	var flag = true;	if (flag) {		var style = document.createElement('style');		style.type = 'text/css';		//var box= document.createTextNode(#box{background:red}'); IE不支持		//style.appendChild(box);		document.getElementsByTagName('head')[0].appendChild(style);		insertRule(document.styleSheets[0], 'body', 'background:red', 0);	}	function insertRule(sheet, selectorText, cssText, position) {		//如果是非IE		if (sheet.insertRule) {			sheet.insertRule(selectorText + "{" + cssText + "}", position);		//如果是IE		} else if (sheet.addRule) {			sheet.addRule(selectorText, cssText, position);		}	}</script>