本文实例讲述了jQuery实现高亮显示网页关键词的方法。分享给大家供大家参考。具体如下：
这是一款基于jquery实现的高亮显示网页上搜索关键词的代码，当你在文本框中输入的时候，如果下面的正文中包括你输入的内容，也就是关键字，那么这些关键字是会高亮显示的，被动态添加成黄色，看上去很醒目，就像百度快照显示关键词的样子。
运行效果如下图所示：
<!DOCTYPE html>
<head>
<meta http-equiv=
"Content-Type"
content=
"text/html; charset=utf-8"
/>
<title>jquery文字高亮显示</title>
<style type=
"text/css"
>
.highlight {
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#fff34d;
-moz-border-radius: 5px;
/* FF1+ */
-webkit-border-radius: 5px;
/* Saf3-4 */
border-radius: 5px;
/* Opera 10.5, IE 9, Saf5, Chrome */
-moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
/* FF3.5+ */
-webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
/* Saf3.0+, Chrome */
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
/* Opera 10.5+, IE 9.0 */
}
.highlight {
padding:1px 4px;
margin:0 -4px;
}
</style>
</head>
<body>
Search: <input type=
"text"
id=
"text-search"
/>
<p>This can include web design, web content development, client liaison, client-side/server-side scripting, web server and network security configuration, and e-commerce development. However, among web professionals,
"web development"
usually refers to the main non-design aspects of building web sites: writing markup and coding. Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, or social ntwork services.</p>
(Text from Wikipedia)
<script type=
"text/javascript"
src=
"jquery-1.6.2.min.js"
></script>
<script type=
"text/javascript"
>
jQuery.fn.highlight =
function
(pat) {
function
innerHighlight(node, pat) {
var
skip = 0;
if
(node.nodeType == 3) {
var
pos = node.data.toUpperCase().indexOf(pat);
if
(pos >= 0) {
var
spannode = document.createElement(
'span'
);
spannode.className =
'highlight'
;
var
middlebit = node.splitText(pos);
var
endbit = middlebit.splitText(pat.length);
var
middleclone = middlebit.cloneNode(
true
);
spannode.appendChild(middleclone);
middlebit.parentNode.replaceChild(spannode, middlebit);
skip = 1;
}
}
else
if
(node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
for
(
var
i = 0; i < node.childNodes.length; ++i) {
i += innerHighlight(node.childNodes[i], pat);
}
}
return
skip;
}
return
this
.each(
function
() {
innerHighlight(
this
, pat.toUpperCase());
});
};
jQuery.fn.removeHighlight =
function
() {
function
newNormalize(node) {
for
(
var
i = 0, children = node.childNodes, nodeCount = children.length; i < nodeCount; i++) {
var
child = children[i];
if
(child.nodeType == 1) {
newNormalize(child);
continue
;
}
if
(child.nodeType != 3) {
continue
; }
var
next = child.nextSibling;
if
(next ==
null
|| next.nodeType != 3) {
continue
; }
var
combined_text = child.nodeValue + next.nodeValue;
new_node = node.ownerDocument.createTextNode(combined_text);
node.insertBefore(new_node, child);
node.removeChild(child);
node.removeChild(next);
i--;
nodeCount--;
}
}
return
this
.find(
"span.highlight"
).each(
function
() {
var
thisParent =
this
.parentNode;
thisParent.replaceChild(
this
.firstChild,
this
);
newNormalize(thisParent);
}).end();
};
</script>
<script type=
"text/javascript"
>
$(
function
() {
$(
'#text-search'
).bind(
'keyup change'
,
function
(ev) {
// pull in the new value
var
searchTerm = $(
this
).val();
// remove any old highlighted terms
$(
'body'
).removeHighlight();
// disable highlighting if empty
if
( searchTerm ) {
// highlight the new term
$(
'body'
).highlight( searchTerm );
}
});
});
</script>
</body>
</html>