web关键词搜索高亮代码

<script type="text/javascript">
/*
* 参数说明:
* obj: 对象, 要进行高亮显示的html标签节点.
* hlWords: 字符串, 要进行高亮的关键词词, 使用 竖杠(|)或空格分隔多个词 .
* bgColor: 背景颜色，默认为红色.
*/
function MarkHighLight(obj, hlWords, bgColor) {
hlWords = AnalyzeHighLightWords(hlWords);
if (obj == null || hlWords.length == 0)
return;
if (bgColor == null || bgColor == "") {
bgColor = "red";
}
MarkHighLightCore(obj, hlWords);
//执行高亮标记的核心方法
function MarkHighLightCore(obj, keyWords) {
var re = new RegExp(keyWords, "i");
var style = ' style="background-color:' + bgColor + ';" '
for (var i = 0; i < obj.childNodes.length; i++) {
var childObj = obj.childNodes[i];
if (childObj.nodeType == 3) {
if (childObj.data.search(re) == -1) continue;
var reResult = new RegExp("(" + keyWords + ")", "gi");
var objResult = document.createElement("span");
objResult.innerHTML = childObj.data.replace(reResult, "<span" + style + ">$1</span>");
if (childObj.data == objResult.childNodes[0].innerHTML) continue;
obj.replaceChild(objResult, childObj);
} else if (childObj.nodeType == 1) {
MarkHighLightCore(childObj, keyWords);
}
}
}
//分析关键词
function AnalyzeHighLightWords(hlWords) {
if (hlWords == null) return "";
hlWords = hlWords.replace(/\s+/g, "|").replace(/\|+/g, "|");
hlWords = hlWords.replace(/(^\|*)|(\|*$)/g, "");
if (hlWords.length == 0) return "";
var wordsArr = hlWords.split("|");
if (wordsArr.length > 1) {
var resultArr = BubbleSort(wordsArr);
var result = "";
for (var i = 0; i < resultArr.length; i++) {
result = result + "|" + resultArr[i];
}
return result.replace(/(^\|*)|(\|*$)/g, "");
} else {
return hlWords;
}
}
//利用冒泡排序法把长的关键词放前面
function BubbleSort(arr) {
var temp, exchange;
for (var i = 0; i < arr.length; i++) {
exchange = false;
for (var j = arr.length - 2; j >= i; j--) {
if ((arr[j + 1].length) > (arr[j]).length) {
temp = arr[j + 1]; arr[j + 1] = arr[j]; arr[j] = temp;
exchange = true;
}
}
if (!exchange) break;
}
return arr;
}
}
//end
window.onload = function search() {
var obj = document.getElementById("container");
var keyWord = "${str}";
MarkHighLight(obj, keyWord, "Yellow");
}
</script>