解析javascript 实用函数的使用详解

  

复制代码 代码如下:

  function addBookMark(url, title){

  //将网页添加到收藏addBookMark(window.location,document.title)

  if(document.all){

  window.external.addFavorite(url,title);

  }else if (window.sidebar){

  window.sidebar.addPanel(title,url,'');

  }else{

  alert('添加失败');

  }

  }  

  function setHomepage(obj,url) {

  // setHome(this, window.location)

  try {

  obj.style.behavior = 'url(#default#homepage)';

  obj.setHomePage(url);

  } catch (e) {

  if (window.netscape) {

  try {

  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");

  } catch (e) {

  alert('此操作被浏览器拒绝!\n请在浏览器地址栏输入"about:config"并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为"true",双击即可。');

  }

  var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);

  prefs.setCharPref('browser.startup.homepage', vrl);

  }

  }

  }

  function boxMove(box){

  //可移动的层

  var w = box.scrollWidth,h = box.scrollHeight;

  var iWidth = document.documentElement.clientWidth;

  var iHeight = document.documentElement.clientHeight;

  var moveX = 0,moveY = 0,moveTop = 0,moveLeft = 0,moveable = false;

  box.onmousedown = function(e){

  moveable = true;

  e = window.event?window.event:e;

  moveX = e.clientX-box.offsetLeft;

  moveY = e.clientY-box.offsetTop;

  box.style.zIndex++;

  }

  document.onmousemove = function(e){

  if(moveable){

  e = window.event?window.event:e;

  var x = e.clientX - moveX;

  var y = e.clientY - moveY;

  if ( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight)){

  box.style.left = x + "px";

  box.style.top = y + "px";

  box.style.margin = "auto";

  }

  }

  }

  document.onmouseup = function (){moveable = false;};

  }

  function getHtmlRoot(){

  /*获得html文档的根元素*/

  if(document.compatMode.toLowerCase()=="css1compat"){

  htmlRoot = document.documentElement;

  }else{

  htmlRoot = document.body;

  }

  return htmlRoot;

  }

  function showWindow(boxId, closeId, showBg){//弹窗

  htmlRoot = getHtmlRoot();

  box = document.getElementById(boxId);

  boxId = '#' + boxId;

  closeId = '#' + closeId;

  showBox = $(boxId);

  showBox.show();

  z_index = 20;

  moveLeft =  (htmlRoot.clientWidth- box.clientWidth)/2 + htmlRoot.scrollLeft +'px';

  moveTop = (htmlRoot.clientHeight - box.clientHeight)/2 + htmlRoot.scrollTop;+'px';

  showBox.css({position:'absolute', left:moveLeft,zIndex:z_index, top:moveTop});

  boxMove(box);

  if(showBg){

  objMask = document.createElement("div");

  objMask.className = "BoxMask";

  htmlRoot.appendChild(objMask);

  objMask.style.cssText += 'position:absolute;top:0; left:0;filter:Alpha(Opacity=50);opacity:0.5;background:#AAA;';

  objMask.style.zIndex = z_index -1;

  objMask.style.width =  htmlRoot.clientWidth + 'px';

  objMask.style.height = htmlRoot.scrollHeight + htmlRoot.scrollTop + 'px';

  }

  $(closeId).click(function(){

  showBox.hide();

  mybg.style.display = "none";

  });

  $('.closeBtn').click = function(){

  showBox.hide();

  mybg.style.display = "none";

  };

  }

  function getFormQuery(formId){

  /*生成查询字串*/

  formObj = document.getElementById(formId);

  var i, queryString = "", and = "", itemValue;

  for(i = 0; i<formObj.length; i++ ){

  var item = formObj[i];

  if ( item.name!='' ){

  if(item.type == 'select-one'){

  itemValue = item.options[item.selectedIndex].value;

  }else if ( item.type=='checkbox' || item.type=='radio'){

  if ( item.checked == false ){ continue; }

  itemValue = item.value;

  }else if ( item.type == 'button' || item.type == 'submit' || item.type == 'reset' || item.type == 'image'){

  continue;

  }else{

  itemValue = item.value;

  }

  //  itemValue = escape(itemValue);

  queryString += and + item.name + '=' + itemValue;

  and="&";

  //queryString += and + encodeURIComponent(item.name) + '=' +encodeURIComponent( itemValue);

  }

  }

  return queryString;

  }

  //定义js错误处理函数

  onerror = errHandle;

  function errHandle(msg,url,line){

  var txt=""

  txt = "本页中有错误!\n\n"

  txt += "错误: "+ msg +"\n"

  txt += "地址: " + url + "\n"

  txt += "行数: " + line + "\n\n"

  alert(txt);

  return false;

  }

  function setAutoWidth(id,width,size){

  //最小或最大宽度

  var obj = document.getElementById(id);

  if(size=='max'){

  obj.style.width = (obj.clientWidth > width) ? width + "px" : "auto";

  }else{

  obj.style.width = (obj.clientWidth < width) ? width + "px" : "auto";

  }

  }

  function fontScroll(id){

  /*向左滚动的文字 */

  var obj = document.getElementById(id);

  var text = obj.innerHTML;

  var first = text.charAt(0);

  var left = text.substring(1, text.length);

  obj.inerHTML = left + first;

  //这个写函数之外 setInterval('fontScroll(id)', 500);

  }

  function bubbleSort(arr){

  /*冒泡排序法*/

  var sign = false // 初始化换位标记为假

  for(var i=0; i < arr.length-1; i++){

  for(varj=0; j < arr.length-1-i; j++){

  if(arr[j]> arr[j+1]){

  vartemp = arr[j]

  arr[j]= arr[j+1]

  arr[j+1]= temp

  sign= true // 若当前这一圈比较中,有过换位,则置换位标记为真

  }

  }

  if(sign)// 判断当前这一圈有过换位否…

  sign= false // 有过换位,则重置换位标记为假

  else

  break// 没有,则终止

  }

  return arr;

  }

  function getCoordinate(evt){

  /*获得光标的坐标*/

  var x = evt.clientX;

  var y = evt.clientY;

  document.getElementById('show').innerHTML = x +' &' + y;

  }

  function checkEmail(email){

  /*检测多个以分号(;)分隔的Email格式*/

  if(email != null){

  if(email.indexOf(";",0) == -1){ //indexOf(被查找,起始位)返某个字符串在源字符串中首次出现的位置,失败返回-1

  if(!isEmail(email)){

  alert("单个邮件格式有误,请重输!");

  document.getElementById("email").focus();

  return false;

  }

  }else{

  var emailArr = email.split(";");//split(分隔段,数组总长度)字符串分割成字符串数组

  var i, iMax = emailArr.length;

  for(i = 0; i < iMax; i++){

  if(emailArr[i] != null || emailArr != ""){

  if(!isEmail(emailArr[i])){

  alert("多个邮箱格式中有邮箱格式不正确,请重新核对后再输入!");

  document.getElementById("email").focus();

  return false;

  }

  }

  }

  }

  }

  function isEmail(str){

  var reg = /^(\w)+(\.\w+)*@(\w)+((\.\w+)+)$/;

  return reg.test(str);//test(被测字串)检测一个字符串是否匹配某个模式.

  }

  }