<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div>曾经沧海难为水，除去巫山不是云 取次花丛懒回顾，半缘修道半缘君</div>
</body>
</html>
//方法1
function highLightCode0(node, keyworlds) {
var patt = new RegExp((keyworlds), "g")
//replace 传入函数 arguments[0] 是匹配到的内容
node.innerHTML = node.textContent.replace(patt, function() {
return "<strong>" + arguments[0] + "</strong>"
})
}
//方法2
function highLightCode1(node, keyworlds) {
var text = node.textContent;
node.textContent = null;
var patt = new RegExp(keyworlds, "g") var match, pos = 0;
while (match = patt.exec(text)) { //匹配词语的之前部分
node.appendChild(document.createTextNode(text.slice(pos, match.index))); //匹配词语
var strong = document.createElement("strong");
strong.appendChild(document.createTextNode(match[0]));
node.appendChild(strong);
pos = patt.lastIndex;
} //匹配词语的之后部分
node.appendChild(document.createTextNode(text.slice(pos)))}
new highLightCode(document.querySelector("div"), "半")
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