javascript实现页面内关键词高亮显示代码
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-type" content="text/html;charset=utf-8" />
<title>关键字高亮显示</title>
</head>
<body>
<div class="result" id="textbox">
<p>百度（Nasdaq简称：BIDU）是全球最大的中文搜索引擎，2000年1月由李彦宏、徐勇两人创立于北京中关村，致力于向人们提供“简单，可依赖”的</p>
<p>信息获取方式。“百度”二字源于中国宋朝词人辛弃疾的《青玉案・元夕》词句“众里寻他千百度”，象征着百度对中文信息检索技术的执著追求。</p>
</div>
<script>
function highlight(idVal, keyword) {
var textbox = document.getElementById(idVal);
if ("" == keyword) return;
//获取所有文字内容
var temp = textbox.innerHTML;
console.log(temp);
var htmlReg = new RegExp("\<.*?\>", "i");
var arr = new Array();
//替换HTML标签
for (var i = 0; true; i++) {
//匹配html标签
var tag = htmlReg.exec(temp);
if (tag) {
arr[i] = tag;
} else {
break;
}
temp = temp.replace(tag, "{[(" + i + ")]}");
}
// 讲关键词拆分并入数组
words = decodeURIComponent(keyword.replace(/\,/g, ' ')).split(/\s+/);
//替换关键字
for (w = 0; w < words.length; w++) {
// 匹配关键词，保留关键词中可以出现的特殊字符
var r = new RegExp("(" + words[w].replace(/[(){}.+*?^$|\\\[\]]/g, "\\$&") + ")", "ig");
temp = temp.replace(r, "<b style='color:Red;'>$1</b>");
}
//恢复HTML标签
for (var i = 0; i < arr.length; i++) {
temp = temp.replace("{[(" + i + ")]}", arr[i]);
}
textbox.innerHTML = temp;
}
highlight("textbox","百度,李彦宏");
</script>
</body>
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