javascript实现网页内容查找功能

【Javascript】

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javascript实现网页内容查找功能

<script language="JavaScript">
    var n = 0;
    function findInPage() {
        var str=document.getElementById("searchstr").value;
        if (str==""){
            alert("请输入关键词");
            return false;
        }
        var txt, i, found;
        if (document.all){
            // IE
            txt = window.document.body.createTextRange();
            for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {
                txt.moveStart("character",1);
                txt.moveEnd("textedit");
            }
            if (found) {
                txt.moveStart("character", -1);
                txt.findText(str);
                txt.select();
                txt.scrollIntoView();
                n++;
            }else{
                if (n > 0) {
                    n = 0;
                    findInPage();
                }else{
                    alert("未找到指定内容");
                }
            }
        }else if(document.layers){
            if (!window.find(str))
                while(window.find(str, false, true))
                    n++;
            else
                n++;
            if (n == 0)alert("未找到指定内容.");
        }else{
            //ff chrome
            window.find(str, false, true);
            return true;
        }
        return false;
    }
</script>