异步加载javascript
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function loadJs(file) {
var frm = document.getElementById("frm");
var doc = frm.contentWindow.document;
var scriptTag = doc.getElementById('loadScript');
var head = doc.getElementsByTagName("head")[0];
if(scriptTag)head.removeChild(scriptTag);
script=document.createElement('script');
script.src=file;
script.type='text/javascript';
script.id='loadScript';
head.appendChild(script);
}
function loadCss(file) {
var frm = document.getElementById("frm");
var doc = frm.contentWindow.document;
var cssTag=doc.getElementById('loadCss');
var head=doc.getElementsByTagName('head').item(0);
if(cssTag)head.removeChild(cssTag);
css=document.createElement('link');
css.href=file;
css.rel='stylesheet';
css.type='text/css';
css.id='loadCss';
head.appendChild(css);
}
var frm = document.getElementById("frm");
var doc = frm.contentWindow.document;
var scriptTag = doc.getElementById('loadScript');
var head = doc.getElementsByTagName("head")[0];
if(scriptTag)head.removeChild(scriptTag);
script=document.createElement('script');
script.src=file;
script.type='text/javascript';
script.id='loadScript';
head.appendChild(script);
}
function loadCss(file) {
var frm = document.getElementById("frm");
var doc = frm.contentWindow.document;
var cssTag=doc.getElementById('loadCss');
var head=doc.getElementsByTagName('head').item(0);
if(cssTag)head.removeChild(cssTag);
css=document.createElement('link');
css.href=file;
css.rel='stylesheet';
css.type='text/css';
css.id='loadCss';
head.appendChild(css);
}
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