javascript仿password功能，将用户输入的信息替换成圆点。然后得到用户输入的字符串；当然还有其他的操作需要处理，这里就不一一处理；这里是大致实现的思路和方法。 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>filterStr.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <script type="text/javascript"> String.prototype.replaceAll = function(s1, s2) { var temp = this; while (temp.indexOf(s1) != -1) { temp = temp.replace(s1, s2); } return temp; } function filter(event, o) { var e = event || window.event; var currentKey = event.keyCode || event.which || event.charCode; var temp = o.value; var filterVal = ""; if (currentKey == 13 || (currentKey > 16 && currentKey < 46) || (currentKey > 112 && currentKey < 123) || currentKey == 144) { //这里需要屏蔽掉一些无输入字符的键，如：回车、shift、alt、Home、delete等;暂时就列举这么多，其他就不一一列举； return; } else if (currentKey == 8) { filterVal = o.getAttribute("filterValue") == undefined ? "" : o.getAttribute("filterValue"); filterVal = filterVal.substring(0, temp.length); o.setAttribute("filterValue", filterVal); } else { var startIndex = temp.lastIndexOf('●'); startIndex = startIndex == -1 ? 0 : startIndex + 1; var val = temp.substring(startIndex, temp.length); filterVal = o.getAttribute("filterValue") == undefined ? "" : o.getAttribute("filterValue"); filterVal += val; o.setAttribute("filterValue", filterVal); var ary = temp.split(''); var result = ""; for (var i = 0; i < ary.length; i++) { if (ary[i] != "●") { result = temp.replaceAll(ary[i], '●'); } } o.value = result; } } function getVal() { alert(document.getElementById("s").getAttribute("filterValue")); } </script> </head> <body> <input type="text" id="s" onkeyup="filter(event, this)"/> <input type="button" value=" get Value " onclick="getVal()"> </body> </html>
posted on 2010-07-26 16:06 java课程设计 阅读(281) 评论(0) 收藏 举报
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