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javascript check all and uncheck

<script language='javascript'>
function toggleAll(cb)
{
    var val = cb.checked;
    var frm = document.forms[0];
    var len = frm.elements.length;
    var i=0;
    for( i=0 ; i<len ; i++)
  &nb ......

[·­Òë]High Performance JavaScript(002)

Grouping Scripts ³É×é½Å±¾
    Since each <script> tag blocks the page from rendering during initial download, it's helpful to limit the total number of <script> tags contained in the page. This applies to both inline scripts as well as those in external files. Every time ......

[·­Òë]High Performance JavaScript(004)

XMLHttpRequest Script Injection  XHR½Å±¾×¢Èë
    Another approach to nonblocking scripts is to retrieve the JavaScript code using an XMLHttpRequest (XHR) object and then inject the script into the page. This technique involves creating an XHR object, downloading the JavaScript f ......
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