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function isDigit(s) {
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec(s)) return false
return true
}
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function isRegisterUserName(s) {
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/;
if (!patrn.exec(s)) return false
return true
}
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function isTrueName(s){
var patrn=/^[a-zA-Z]{1,30}$/;
if (!patrn.exec(s)) return false
return true
}
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function isPasswd(s){
var patrn=/^(\w){6,20}$/;
if (!patrn.exec(s)) return false
return true
}
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this.url = url;
this.showUrl = function(){
alert(this.url);
}
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