//用于隐藏部分手机号，银行卡号的javascript方法
replaceStr : function(str,keepLength,replaceChar,iskeeplast){
iskeeplast = iskeeplast ? iskeeplast : true;
keepLength = keepLength ? keepLength : 0;
replaceChar = replaceChar ? replaceChar : '*';
var sub = '';
var length = str.length - keepLength;
var replacement = '';
if(iskeeplast){
sub = str.substring(0, str.length - keepLength);
} else {
sub = str.substring(str.length - keepLength, str.length);
}
for(var i = 0; i < length; i++){
replacement += replaceChar;
};
return str.replace(sub,replacement);
}
