如
var str1 = "aa;bb;cc;";
var str2 = "aa;bb;cc";
var str3 = ";aa;bb;cc";
var str4 = ";aa;bb;cc;"
判断前后有没 ";",如果没有就加,有就不加。谢谢各位
var str1 = "aa;bb;cc;";
var str2 = "aa;bb;cc";
var str3 = ";aa;bb;cc";
var str4 = ";aa;bb;cc;"
判断前后有没 ";",如果没有就加,有就不加。谢谢各位
function getS(str)
{
_arr=str.split(";");
if(_arr[0].length>0){str=';'+str;}
if(_arr[_arr.length-1].length>0){str=str+';'}
return str;
}
function getS(str)
{
if(str.length==0){return str}
if(str.substring(0,1)!=';'){str=';'+str}
if(str.substring(str.length-1,str.length)!=';'){str=str+';'}
return str;
}
<!doctype html>
<html>
<head>
<title>test</title>
<script type="text/javascript">
function ck() {
var reg1 = /^\;.*/;
var reg2 = /.*\;$/;
var val = document.getElementById("a").value;
if (!reg1.test(val)) {
val = ";" + val;
}
if (!reg2.test(val)) {
val = val + ";";
}
document.getElementById("a").value = val;
}
</script>
</head>
<body>
<input id="a" type="text" />
<input type="button" value="submit" onclick="ck()" />
</body></html>
var s = ["aa;bb;cc;","aa;bb;cc",";aa;bb;cc",";aa;bb;cc;"];
for(var i=s.length-1;i>=0;i--)s[i]=s[i].replace(/(^[^;])/,';$1').replace(/([^;]$)/,'$1;');//检测
for(var i=0,il=s.length;i<il;i++)alert(s[i]);
这位朋友的方法应该更优,借用,修正一下,顺便做个标记
function getS(str)
{
return str.replace(/(^[^;])/,';$1').replace(/([^;]$)/,'$1;');
}