javascript 限制输入和粘贴(IE,firefox测试通过)

复制代码代码如下:window["MzBrowser"] ={}; (function() { if(MzBrowser.platform) return; var ua = window.navigator.userAgent; MzBrowser.platform = window.navigator.platform; MzBrowser.firefox = ua.indexOf("Firefox") > 0; MzBrowser.opera = typeof(window.opera) == "object"; MzBrowser.ie = ! MzBrowser.opera && ua.indexOf("MSIE") > 0; MzBrowser.mozilla = window.navigator.product == "Gecko"; MzBrowser.netscape = window.navigator.vendor == "Netscape"; MzBrowser.safari = ua.indexOf("Safari") > - 1; if(MzBrowser.firefox) var re = /Firefox(s|/)(d+(.d+)?)/; else if(MzBrowser.ie) var re = /MSIE( )(d+(.d+)?)/; else if(MzBrowser.opera) var re = /Opera(s|/)(d+(.d+)?)/; else if(MzBrowser.netscape) var re = /Netscape(s|/)(d+(.d+)?)/; else if(MzBrowser.safari) var re = /Version(/)(d+(.d+)?)/; else if(MzBrowser.mozilla) var re = /rv(:)(d+(.d+)?)/; if("undefined" != typeof(re) && re.test(ua)) MzBrowser.version = parseFloat(RegExp.$2); } )(); function upLoadKey(e, object) { if((document.all) ? true : false) { window.event.keyCode == 9 ? (window.event.returnValue = true) : (window.event.returnValue = false); } else { if(object.value == "" && typeof e.which == "number")e.preventDefault(); if(object.value != "") object.blur(); } } function version(object) { if(MzBrowser.firefox && MzBrowser.version == 2)object.blur(); } function clearValue(id) { var up = (typeof id == "string") ? document.getElementById(id) : id; if (typeof up != "object") return null; var tt = document.createElement("span"); tt.id = "__tt__"; up.parentNode.insertBefore(tt, up); var tf = document.createElement("form"); tf.appendChild(up); document.getElementsByTagName("body")[0].appendChild(tf); tf.reset(); tt.parentNode.insertBefore(up, tt); tt.parentNode.removeChild(tt); tt = null; tf.parentNode.removeChild(tf); } // 页面代码复制代码代码如下:<html> <head> <script language="javascript" src="upLoad.js"></script> </head> <body> <input name="textfield3" type="file" class="input" id="textfield3" size="30" value="" ondrag="return false;" oncut="return false;" onkeydown="upLoadKey(event,this);" onpaste="return false;" onmousedown="document.oncontextmenu = function() { return false;}" onmouseout="document.oncontextmenu = function() { return true;};version(this);" tabIndex = -1/> <input type="button" id="clear" value="清空" onclick="clearValue('textfield3');"/> </body> </html>

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