文本输入框数字校验

·限定输入框只能输入0~9和小数点

$(function() {

$(document).keydown(function(event) {
if (event.keyCode == 13) {
return transOut($("#maintrans"));


}
});
$("#changeCredit").keyup(function(){replaceNaN(this);});
$("#changeCredit").keypress(function(){replaceNaN(this);});
$("#changeCredit").keydown(function(){replaceNaN(this);});
});

function replaceNaN(obj){
$(obj).val($(obj).val().replace(/[^0-9|\.]/g,''));
var txtVal = $(obj).val();
//console.log("txtVal="+ txtVal + ","+txtVal.length);
if(txtVal=="."){
txtVal = "";
}
while(txtVal.length>0 && txtVal.substr(0,1)=="."){
txtVal = txtVal.substr(1,txtVal.length);
}
$(obj).val(txtVal);
}