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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>7.3 预编译正则表达式</title>
<link rel="stylesheet" href="qunit/qunit-1.18.0.css">
</head>
<body>
<div id="qunit"></div>
<div id="qunit-fixture"></div>
<div class="samurai ninja"></div>
<!--#1-->
<div class="ninja samurai"></div>
<!--#1-->
<div class="undefined"></div>
<!--#1-->
<span class="samurai ninja ronin"></span>
<!--#1-->
<script src="qunit/qunit-1.18.0.js"></script>
<script type="text/javascript">
function findClassInElements(className, type)
{
/*
var elems = //#2
document.getElementsByTagName(type || "*");
*/
var elems = document.getElementsByTagName(type);
var regex = //#3
new RegExp("(^|\\s)" + className + "(\\s|$)");
var results = []; //#4
for (var i = 0, length = elems.length; i < length; i++)
if (regex.test(elems[i].className))
{ //#5
results.push(elems[i]);
}
return results;
}
QUnit.test("7.3 预编译正则表达式", function(assert)
{
assert.deepEqual(findClassInElements("ninja", "div").length, 2,
"The right amount fo div ninjas was found.");
assert.deepEqual(findClassInElements("ninja", "span").length, 1,
"The right amount of span ninjas was found.");
assert.deepEqual(findClassInElements("ninja").length, 3,
"The right amount of ninjas was found.");
assert.deepEqual(findClassInElements().length, 10,
"查找所有元素");
});
</script>
</body>
</html>