function validUserAcount(obj){
var this_obj = obj;
var username = this_obj.value;
//合法的字符
var valid_char = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-_'
for (i=0;i<=username.length;i++) {
var the_char=username.charAt(i)
if(valid_char.indexOf(the_char)==-1){
alert('社区帐号不合法!社区帐号只能是数字、字母!')
this_obj.value=username.substring(0,i)
return 1
}
}
if(this_obj.value!=username) this_obj.value=username}
var this_obj = obj;
var username = this_obj.value;
//合法的字符
var valid_char = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-_'
for (i=0;i<=username.length;i++) {
var the_char=username.charAt(i)
if(valid_char.indexOf(the_char)==-1){
alert('社区帐号不合法!社区帐号只能是数字、字母!')
this_obj.value=username.substring(0,i)
return 1
}
}
if(this_obj.value!=username) this_obj.value=username}
有关正则表达式
1.只能输入数字和英文的:
<input onkeyup="value=value.replace(/[\W]/g,'')"
onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
2.只能输入数字的:
<input onkeyup="value=value.replace(/[^\d]/g,'')"
onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
3.只能输入全角的:
<input onkeyup="value=value.replace(/[^\uFF00-\uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\uFF00-\uFFFF]/g,''))">
4.只能输入汉字的:
<input onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))">
<INPUT TYPE="submit">
</FORM>