1. 获取元素坐标

var getPos:function(o){//取元素坐标 var x = 0, y = 0; do{ x += o.offsetLeft; y += o.offsetTop; }while(o=o.offsetParent); return {'x':x,'y':y}; }

2. 获取当前script文件的路径

  var strJsPath='';  (function(){      try {          throw Error("获取路径")      }catch(ex){          if(ex.fileName)//Firefox              strJsPath=ex.fileName          else if(ex.stack)//Chrome              strJsPath=(ex.stack.match(/at\s+(.*?):\d+:\d+/)||['',''])[1];          else if(ex.sourceURL)//Safari              strJsPath=ex.sourceURL       }      if(strJsPath)return; //其实所有浏览器都可以用下面的      var scripts=document.getElementsByTagName("script"),script=scripts[scripts.length-1];      strJsPath=document.querySelector?script.src:script.getAttribute("src",4)//IE8直接.src  })()  

  alert(strJsPath);

3. 获取当前script中的参数

var getScriptArgs=function(){//获取多个参数 var scripts=document.getElementsByTagName("script"), script=scripts[scripts.length-1],//因为当前dom加载时后面的script标签还未加载，所以最后一个就是当前的script src=script.src, reg=/(?:\?|&)(.*?)=(.*?)(?=&|$)/g, temp,res={}; while((temp=reg.exec(src))!=null) res[temp[1]]=decodeURIComponent(temp[2]); return res; }; var args=getScriptArgs(); alert(args.a+" | "+args.b+" | "+args.c); //假如上面的js是在这个js1.js的脚本中< script type="text/javascript" src="js1.js?a=abc&b=汉字&c=123">< /script> var getScriptArg=function(key){//获取单个参数 var scripts=document.getElementsByTagName("script"), script=scripts[scripts.length-1], src=script.src; return (src.match(new RegExp("(?:\\?|&)"+key+"=(.*?)(?=&|$)"))||['',null])[1]; }; alert(getScriptArg("c"));

4.控制上传file的文件类型

<input type="file" onchange="checkExt(this)"/> <script type="text/javascript"> var checkExt=function(file) { if(!(/(?:jpg|gif)$/i.test(file.value))) { alert("只允许上传jpg和gif的图片"); if(window.ActiveXObject) {//for IE file.select();//select the file ,and clear selection document.selection.clear(); } else if(window.opera) {//for opera file.type="text";file.type="file"; } else file.value="";//for FF,Chrome,Safari } else { alert("ok");//or you can do nothing here. } }; </script>

5.js获取url中的参数

//lastest: var getArgs=function() {//get url querystring var params=document.location.search,reg=/(?:^\?|&)(.*?)=(.*?)(?=&|$)/g,temp,args={}; while((temp=reg.exec(params))!=null) args[temp[1]]=decodeURIComponent(temp[2]); return args; }; //只取一个： var queryString=function(key){ return (document.location.search.match(new RegExp("(?:^\\?|&)"+key+"=(.*?)(?=&|$)"))||['',null])[1]; } var args=getArgs(); alert(args.name+" | "+args.sex+" | "+args.age); //测试链接：< a href="?name=abc&sex=男&age=12">test getQueryString //deprecated var getArgs=function() { var params=document.location.search.substr(1),reg=/(?:^|&)(.*?)=(.*?)(?:&|$)/g,temp,args={}; while((temp=reg.exec(params))!=null) { args[temp[1]]=temp[2]; reg.lastIndex-=1;//减1，下一次从结束的&开始匹配 } return args; }; var getArgs=function(){ var sarg = document.location.search.substr(1),rv={}; rv.filename = document.location.pathname.replace(/.*\//ig,''); if(!sarg){return rv;} var aarg = sarg.split('&'),atmp=[]; for(var i=0;i< aarg.length;i++){ atmp = aarg[i].split('='); rv[atmp[0]] = unescape(atmp[1]); } return rv; };

 6.js Unicode编码转换

/* *js Unicode编码转换 */ var decToHex = function(str) { var res=[]; for(var i=0;i < str.length;i++) res[i]=("00"+str.charCodeAt(i).toString(16)).slice(-4); return "\\u"+res.join("\\u"); } var decToHex2 = function(str) { var res="",c; for(var i=0;i < str.length;i++){ c=str.charCodeAt(i); res+=(c< 32 || c==38 || c>127)?"\\u"+c.toString(16):str.charAt(i) } return res } var hexToDec = function(str) { str=str.replace(/\\/g,"%"); return unescape(str); } var str=decToHex2("decToHex unicode 编码转换"); alert("编码后："+str+"\n\n解码后："+hexToDec(str));

7.js HTML编码转换

  /*   *js HTML Encode   */   var htmlEncode=function(str) {//HTML des encode.      var res=[];      for(var i=0;i < str.length;i++)          res[i]=str.charCodeAt(i);      return "&#"+res.join(";&#")+";";  };  var htmlEncode2=function(s) {      var r = "", c;      for (var i = 0; i < s.length; i++) {          c = s.charCodeAt(i);          r += (c < 32 || c == 38 || c > 127) ? ("&#" + c + ";") : s.charAt(i);      }      return r;  };  //s.replace(/([\u4e00-\u9fa5]+)/g,function($,$1) {  //    return htmlEncode($1);  //})  var htmlHexEncode=function(str) {//HTML hex encode.      var res=[];      for(var i=0;i < str.length;i++)          res[i]=str.charCodeAt(i).toString(16);      return "&#"+String.fromCharCode(0x78)+res.join(";&#"+String.fromCharCode(0x78))+";";//x ，防止ff下&#x 转义  };  var htmlDecode = function(str) {      return str.replace(/&#(x)?([^&]{1,5});?/g,function($,$1,$2) {          return String.fromCharCode(parseInt($2 , $1 ? 16:10));      });  };  var s="htmlEncode HTML 编码转换 &#";  var s1=htmlEncode(s)+"\n\n只对双字节和&编码："+htmlEncode2(s);  var s2=htmlDecode(s1);  alert("编码前："+s+"\n\n编码后："+s1+"\n\n解码后："+s2);    var s="htmlHexEncode HTML 编码转换&#";  var s1=htmlHexEncode(s);  var s2=htmlDecode(s1);  alert("编码前："+s+"\n\n编码后："+s1+"\n\n解码后："+s2);

8. js 全半角转换

/* *全角空格为12288，半角空格为32 *其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248 */ function SBC(text) { return text.replace(/[\x20-\x7e]/g, function($) { return $ == " " ? "\u3000" : String.fromCharCode($.charCodeAt(0) + 0xfee0); }); } var toDBC=function(input) {//to DBC case var res="",c; for(var i=0;i< input.length;i++) { c=input.charCodeAt(i); if(c >=0xFF01 && c <=0xFF5E)// 65281 65374 res+=String.fromCharCode(c-0xFEE0);//65248 else if(c==0x3000)//12288 res+=String.fromCharCode(0x20);//32 else res+=input.charAt(i); } return res; } var toSBC=function(input) {//to SBC case var res="",c; for(var i=0; i < input.length;i++) { c=input.charCodeAt(i); if(c>=0x21 && c<=0x7e)//33 126 res+=String.fromCharCode(c+0xFEE0); else if(c==0x20) res += String.fromCharCode(0x3000); else res += input.charAt(i); } return res; } var s="，哦哦，hello　ｓｓｓｓ！＃～"; var s1=toDBC(s); var s2=toSBC(s1); alert("原字符："+s+"\n\ntoDBC："+s1+"\n\ntoSBC："+s2);