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<script>
function changeUrlArg(url, arg, val){ 
	var pattern = arg+‘=([^&]*)‘; 
	var replaceText = arg+‘=‘+val;
	return url.match(pattern) ? url.replace(eval(‘/(‘+ arg+‘=)([^&]*)/gi‘), replaceText) : (url.match(‘[\?]‘) ? url+‘&‘+replaceText : url+‘?‘+replaceText);
} 
document.write(changeUrlArg(‘http://www.t.com/test.php?class_id=3&id=2‘, ‘id‘, 4));
</script>
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原文地址:http://www.cnblogs.com/doseoer/p/5747715.html