文章主要內(nèi)容列表：
1、 調(diào)整圖片大小，不走形（FF IE 兼容）/ 剪切圖片（overflow:hidden）
2、 控制textarea區(qū)域文字?jǐn)?shù)量
3、 點(diǎn)擊顯示新窗口
4、 input框自動(dòng)隨內(nèi)容自動(dòng)變長(zhǎng)
5、 添加收藏夾
6、 設(shè)置首頁(yè)
7、 Jquery + Ajax 判斷用戶是否存在
8、 判斷email格式是否正確
9、 綜合判斷用戶名（長(zhǎng)度，英文字段等）
10、新聞滾動(dòng)
11、 只允許輸入正整數(shù) （shopping cart 使用） 或者 正數(shù) （正整數(shù)和正小數(shù)）
12、 轉(zhuǎn)換字符串為數(shù)字
13、 判斷文件格式（獲得文件后綴）
14、 截取字符串
15、分割字符串
主要內(nèi)容 ：
1、 調(diào)整圖片大小，不走形（FF IE 兼容）
// 用法 <img src="this_image_path.jpg" onload="DrawImage(this,450,450);" /> function DrawImage(ImgD,FitWidth,FitHeight){ var image=new Image(); image.src=ImgD.src; if(image.width>0 && image.height>0){ if(image.width/image.height>= FitWidth/FitHeight){ if(image.width>FitWidth){ ImgD.width=FitWidth; ImgD.height=(image.height*FitWidth)/image.width; }else{ ImgD.width=image.width; ImgD.height=image.height; } } else{ if(image.height>FitHeight){ ImgD.height=FitHeight; ImgD.width=(image.width*FitHeight)/image.height; }else{ ImgD.width=image.width; ImgD.height=image.height; } } } } 通過(guò) overflow：hidden進(jìn)行剪切：
function clipImage(o, w, h){ var img = new Image(); img.src = o.src; if(img.width >0 && img.height>0) { if(img.width/img.height >= w/h) { if(img.width > w) { o.width = (img.width*h)/img.height; o.height = h; //o.setAttribute("style", "marginLeft:-" + ((o.width-w)/2).toString() + "px"); $(o).css("margin-left", "-"+((o.width-w)/2).toString() + "px"); } else { o.width = img.width; o.height = img.height; } } else { if(img.height > h) { o.height = (img.height*w)/img.width; o.width = w; //o.setAttribute("style", "margin-top:-" + ((o.height-h)/2).toString() + "px"); //$(o).css("style", "margin-top:-" + ((o.height-h)/2).toString() + "px"); $(o).css("margin-top", "-"+((o.height-h)/2).toString() + "px"); } else { o.width = img.width; o.height = img.height; } } } } 實(shí)例：
<style type="text/css"> ul{list-style:none;} ul li{float:left;padding:1px;border:#ccc 1px solid;width:120px;height:120px;overflow:hidden;text-align:center;over-flow:hidden;} </style> <ul> <li><img src="1.jpg" onload="DrawImage(this,120,120);" /></li> <li><img src="2.jpg" onload="clipImage(this,120,120);" /></li> </ul> 2、控制textarea區(qū)域文字?jǐn)?shù)量
<script> /** * Calculate how many characters remain in a textarea (jQuery) * @param string textarea * @param int maxLength * @param string div */ function charsRemain(textarea, maxLength, div) { var currentLength = $(textarea).val().length; var charsLeft = maxLength - currentLength; if (charsLeft < 0) { charsLeft = 0; } $("#"+ div +"_charsRemain").html(charsLeft); if (currentLength > maxLength) { var fullText = $(textarea).val().substring(0, maxLength); $(textarea).val(fullText); } } /** * Calculate how many characters remain in a textarea (javascript) * @param string textarea * @param int maxLength * @param string div */ function charsRemain(textarea, maxLength, div) { var currentLength = textarea.value.length; var charsLeft = maxLength - currentLength; if (charsLeft < 0) { charsLeft = 0; } document.getElementById(div +"_charsRemain").innerHTML = charsLeft; if (currentLength > maxLength) { var fullText = textarea.value.substring(0, maxLength); textarea.value = fullText; } } </script> <textarea rows="5" cols="15" onkeyup="charsRemain(this, 250, 'textarea');"></textarea> <span id="textarea_charsRemain">250</span> characters remaining 3、點(diǎn)擊顯示新窗口
//彈窗 function g_OpenWindow(pageURL, innerWidth, innerHeight) { var ScreenWidth = screen.availWidth var ScreenHeight = screen.availHeight var StartX = (ScreenWidth - innerWidth) / 2 var StartY = (ScreenHeight - innerHeight) / 2 var wins = window.open(pageURL, 'OpenWin', 'left='+ StartX + ', top='+ StartY + ', Width=' + innerWidth +', height=' + innerHeight + ', resizable=yes, scrollbars=yes, status=no, toolbar=no, menubar=no, location=no') wins.focus(); } Java代碼 ：
<script language="JavaScript"> // 自動(dòng)彈出窗口 var whatsNew = open('','_blank','top=50,left=50,width=200,height=300,' + 'menubar=no,toolbar=no,directories=no,location=no,' + 'status=no,resizable=no,scrollbars=yes'); whatsNew.document.write('<center><b>news</b>< /center>'); whatsNew.document.write('<p>this is a test'); whatsNew.document.write('<p>deos address'); whatsNew.document.write('<p align="right">' + '<a href="javascript:self.close()">Close</a>'); whatsNew.document.close(); </script> 不幸的是，很多瀏覽器會(huì)屏蔽彈出窗口，你需要手動(dòng)允許后方可看到！下面是強(qiáng)制彈出窗口，原理就是創(chuàng)建一個(gè)form，通過(guò)post打開。
<script language="javascript"> function ForceWindow (){ this.r = document.documentElement; this.f = document.createElement("FORM"); this.f.target = "_blank"; this.f.method = "post"; this.r.insertBefore(this.f, this.r.childNodes[0]); //XML DOM : insertBefore() 方法可在已有的子節(jié)點(diǎn)前插入一個(gè)新的子節(jié)點(diǎn)。 insertBefore(newchild,refchild) } ForceWindow.prototype.pop = function (sUrl){ this.f.action = sUrl; this.f.submit(); } window.force = new ForceWindow(); </script> <body onLoad="window.force.pop('http://deographics.com/')"> <div> this is a test ! we will open the deographics's website~~ </div> </body> 當(dāng)然還有更好的辦法就是
<script> function openWin(){ window.showModalDialog(url,window, "help:no;scroll:no;resizable:no;status:0;dialogWidth:420px;dialogHeight:200px;center:yes"); } </script> 4、input框自動(dòng)隨內(nèi)容自動(dòng)變長(zhǎng)
// input auto length // <input name="words" size="2" maxlength="100" onkeyup="checkLength(this)"/><span id="char">0</span> function checkLength(which) { var maxchar=100; //var oTextCount = document.getElementById("char"); iCount = which.value.replace(/[^/u0000-/u00ff]/g,"aa").length; if(iCount<=maxchar){ //oTextCount.innerHTML = "<font color=#FF0000>"+ iCount+"</font>"; which.style.border = '1px dotted #FF0000'; which.size=iCount+2; }else{ alert('Please input letter less than '+ maxchar); } } 5、添加收藏夾
// addfavorite function addfavorite(){ if (document.all){ window.external.addFavorite('http://deographics.com/','deographics'); }else if (window.sidebar){ window.sidebar.addPanel('deographics', 'http://deographics.com/', ""); } } 6、設(shè)置首頁(yè)
// setHomepage function setHomepage(){ if(document.all){ document.body.style.behavior = 'url(#default#homepage)'; document.body.setHomePage('http://deographics.com/'); }else if(window.sidebar){ if(window.netscape){ try{ netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); }catch(e){ alert(" The operation was refused by browser,if you want to enable this feature, please enter in the address column 'about:config', then, change 'signed.applets.codebase_principal_support' to 'true' "); } } var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch); prefs.setCharPref('browser.startup.homepage','http://deographics.com/'); } }7、Jquery + Ajax 判斷用戶是否存在
// 檢測(cè) 用戶名是否存在 $("#username").blur(function(){ var name = $(this).val(); var table = $(this).attr('title'); if(name!=''){ var dataString = 'username='+ name + '&table=' + table; $.post("operate.php",dataString,function(data){ //alert(data); if(data==0){ alert('This username already exist !'); $(this).val('').focus(); return false; } }); } }); 或者
var datastring = 'id=' + $id + '&pos=' + $pos; $.ajax({ type: "POST", url: url, data: dataString, beforeSend: function(){}, error: function(){alert('Send Error !');}, success: function(data) { // do something } }); 8、判斷email格式是否正確
function chekemail(temail){ var pattern = /^[/w]{1}[/w/./-_]*@[/w]{1}[/w/-_/.]*/.[/w]{2,4}$/i; if(pattern.test(temail)){return true;}else{return false;} } 9、綜合判斷用戶名（長(zhǎng)度，英文字段等）
// 實(shí)例 var username = $('#username'); var backValue = VerifyInput('username'); if(backValue == 'length'){ alert("Username is make up of 3 - 15 characters!"); username.focus(); return false; }else if(backValue == 'first'){ alert("the First character must be letter or number !"); username.focus(); return false; }else if(backValue == 'back'){ alert("Username only contains letter number or '_' "); username.focus(); return false; } // 判斷 function VerifyInput(user){ var strUserID = $('#'+user).val(); if (strUserID.length < 3 || strUserID.length > 15){ return 'length'; }else{ for (nIndex=0; nIndex<strUserID.length; nIndex++){ cCheck = strUserID.charAt(nIndex); if ( nIndex==0 && ( cCheck =='-' || cCheck =='_') ){ return 'first'; } if (!(IsDigit(cCheck) || IsAlpha(cCheck) || cCheck=='-' || cCheck=='_' )){ return 'back'; } } } } function IsDigit(cCheck) {return (('0'<=cCheck) && (cCheck<='9'));} function IsAlpha(cCheck) {return ((('a'<=cCheck) && (cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z')))} 10、新聞滾動(dòng)
<style type="text/css"> ul,li{margin:0;padding:0;font-size:12px;color:#999;} ul{height:100px;overflow:hidden;} ul li{line-height:20px;height:20px;} </style> <ul id="news"> <li>New York web design Inc.1</li> <li>Your site will be structured 2</li> <li>hat will communicate the 3</li> <li>hat will communicate the 4</li> <li>hat will communicate the 5</li> <li>hat will communicate the 6</li> <li>hat will communicate the 7</li> <li>hat will communicate the 8</li> <li>hat will communicate the 9</li> <li>New York web design Inc. 10</li> <li>New York web design Inc.11</li> <li>New York web design Inc. 12</li> <li>New York web design Inc. 13</li> <li>New York web design Inc. 14</li> </ul> Java代碼
// 用法 : 四個(gè)參數(shù)分別是:操作對(duì)象， 停留時(shí)間，相對(duì)速度（越小越快）,每次滾動(dòng)多少(最好和Li的Line-height一致)。 scroll('news', 3000, 1, 20 ); function scroll(element, delay, speed, lineHeight) { var numpergroup = 5; var slideBox = (typeof element == 'string')?document.getElementById(element):element; var delay = delay||1000; var speed=speed||20; var lineHeight = lineHeight||20; var tid = null, pause = false; var liLength = slideBox.getElementsByTagName('li').length; var lack = numpergroup-liLength%numpergroup; for(i=0;i<lack;i++){ slideBox.appendChild(document.createElement("li")); } var start = function() { tid=setInterval(slide, speed); } var slide = function() { if (pause) return; slideBox.scrollTop += 2; if ( slideBox.scrollTop % lineHeight == 0 ) { clearInterval(tid); for(i=0;i<numpergroup;i++){ slideBox.appendChild(slideBox.getElementsByTagName('li')[0]); } slideBox.scrollTop = 0; setTimeout(start, delay); } } slideBox.onmouseover=function(){pause=true;} slideBox.onmouseout=function(){pause=false;} setTimeout(start, delay); } 11、只允許輸入正整數(shù) （shopping cart 使用）
<script language="JavaScript" type="text/javascript"> function checkNum(obj){ var re = /^[1-9]/d*$/; if (!re.test(obj.value)){ alert("只允許正整數(shù)!"); obj.value=''; obj.focus(); return false; } } </script> <input name="rate" type="text"onkeyup="checkNum(this)" /> 或正數(shù)
<script language="JavaScript" type="text/javascript"> function clearNoNum(obj) { //先把非數(shù)字的都替換掉，除了數(shù)字和. objobj.value = obj.value.replace(/[^/d.]/g,""); //必須保證第一個(gè)為數(shù)字而不是. objobj.value = obj.value.replace(/^/./g,""); //保證只有出現(xiàn)一個(gè).而沒(méi)有多個(gè). objobj.value = obj.value.replace(//.{2,}/g,"."); //保證.只出現(xiàn)一次，而不能出現(xiàn)兩次以上 objobj.value = obj.value.replace(".","$#$").replace(//./g,"").replace("$#$","."); } </script> 只能輸入數(shù)字和小數(shù)點(diǎn)的文本框：<input id="input1" onkeyup="clearNoNum(this)">
12、 轉(zhuǎn)換字符串為數(shù)字
/* js提供了parseInt()和parseFloat()兩個(gè)轉(zhuǎn)換函數(shù)。前者把值轉(zhuǎn)換成整數(shù)，后者把值轉(zhuǎn)換成浮點(diǎn)數(shù)。只有對(duì)String類型調(diào)用這些方法，這兩個(gè)函數(shù)才能正確運(yùn)行；對(duì)其他類型返回的都是NaN(Not a Number)。 */ parseInt("1234blue"); //returns 1234 parseInt("0xA"); //returns 10 parseInt("22.5"); //returns 22 parseInt("blue"); //returns NaN parseFloat("1234blue"); //returns 1234.0 parseFloat("0xA"); //returns NaN parseFloat("22.5"); //returns 22.5 parseFloat("22.34.5"); //returns 22.34 parseFloat("0908"); //returns 908 parseFloat("blue"); //returns NaN /* 還可使用強(qiáng)制類型轉(zhuǎn)換（type casting）處理轉(zhuǎn)換值的類型。使用強(qiáng)制類型轉(zhuǎn)換可以訪問(wèn)特定的值，即使它是另一種類型的。 Boolean(value)――把給定的值轉(zhuǎn)換成Boolean型； Number(value)――把給定的值轉(zhuǎn)換成數(shù)字（可以是整數(shù)或浮點(diǎn)數(shù)）； String(value)――把給定的值轉(zhuǎn)換成字符串。 */ Boolean(""); //false
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