


Detailed explanation of the use of practical functions in parsing javascript_javascript skills
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
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 0 && (y + h 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
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"
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 }
}
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){
/*バブルソートメソッド*/
var signed = false // 転置符号を false に初期化します
for(var i=0; i for(varj=0; j
vartemp = arr[j]
arr[j]= arr[j 1]
arr[j 1]= temp
sign= true // 現在の円の比較に転置がある場合、置換マークは true
}
}
if(sign)// 現在のサークルに置換があったかどうかを判断します...
sign= false // 置換があった場合、 retry 置換ビットは false としてマークされます
else
Break// そうでない場合は終了します
}
return arr;
}
function getCooperative(evt){
/*カーソルの座標を取得*/
var x = evt.clientX;
var y = evt.clientY;
document.getElementById(' show' ).innerHTML = x ' &' y;
}
function checkEmail(email){
/*セミコロン (;) で区切って複数の電子メール形式を検出します*/
if(email != null){
if(email.indexOf(" ;", 0) == -1){ //indexOf(検索済み, 開始位置) は、ソース文字列内で特定の文字列が最初に出現する位置を返します。失敗した場合は、-1
が返されます。 if(!isEmail(email )) {
alert("単一メールの形式が間違っています。再入力してください!"); > }else{
var emailArr = email.split(";");//split (分割されたセグメント、配列の合計長) 文字列は文字列に分割されます array
var i, iMax = emailArr.length;
for(i = 0; i
if(!isEmail(emailArr[i]) ){
alert("複数のメール形式の 1 つが間違っています。入力する前にもう一度確認してください!") ;
document.getElementById("email").focus();
return false ;
}
}
}
}
}
}
function isEmail(str){
var reg = /^(w) (.w )*@(w) ((.w ) )$/;
return reg.test(str);//test (テストされた文字列) は、文字列が特定のパターンに一致するかどうかを検出します。
}
}

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

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Python is more suitable for data science and machine learning, while JavaScript is more suitable for front-end and full-stack development. 1. Python is known for its concise syntax and rich library ecosystem, and is suitable for data analysis and web development. 2. JavaScript is the core of front-end development. Node.js supports server-side programming and is suitable for full-stack development.

JavaScript does not require installation because it is already built into modern browsers. You just need a text editor and a browser to get started. 1) In the browser environment, run it by embedding the HTML file through tags. 2) In the Node.js environment, after downloading and installing Node.js, run the JavaScript file through the command line.


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