JavaScript查找页面文字

var NS4 = (document.layers);var IE4 = (document.all);var win = window; var n = 0;function findInPage(str) { var txt, i, found; if (str =="") return false; if (NS4) { if (!win.find(str)) while(win.find(str, false, true)) n++; else n++; if (n == 0) alert("没有找到。"); } if (IE4) { txt = win.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(str); } else alert("没有找到。"); } } return false;}