js,jquery,php 对小数点的处理
2.只能输入数字,能输小数点.
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">
<input name=txt1 onchange="if(/\D/.test(this.value)){alert('只能输入数字');this.value='';}">
3.数字和小数点方法二
<input type=text tvalue="" ovalue="" onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.tvalue=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.ovalue=this.value" onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.tvalue=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.ovalue=this.value" onblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))this.value=this.o_value;else{if(this.value.match(/^\.\d+$/))this.value=0+this.value;if(this.value.match(/^\.$/))this.value=0;this.ovalue=this.value}">
4.只能输入字母和汉字
<input onkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers">
5.只能输入英文字母和数字,不能输入中文
<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
6.只能输入数字和英文<font color="Red">chun</font>
<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
7.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">
8.小数点后只能有最多两位(数字,字母,中文都可输入),可以输入运算符号:
<input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">
?
?
?
?
function returnFloat0(value) {??//将小数点清零
??? value = Math.round(parseFloat(value));
??? return value;
?? }
function returnFloat1(value) {?//保留一位小数点
??? value = Math.round(parseFloat(value) * 10) / 10;
??? if (value.toString().indexOf(".") < 0)
???? value = value.toString() + ".0";
??? return value;
?? }
function returnFloat(value){??//保留两位小数点
??? value = Math.round(parseFloat(value) * 100) / 100;
??? if (value.toString().indexOf(".") < 0) {
???? value = value.toString() + ".00";
??? }
??? return value;
?? }
function returnFloat2(value) {?//保留两位小数点，一位小数自动补零
??? value = Math.round(parseFloat(value) * 100) / 100;
??? var xsd = value.toString().split(".");
??? //Ext.log(xsd.length);
??? if(xsd.length==1){
???? value = value.toString()+".00";
???? return value;
??? }
??? if(xsd.length>1){
???? if(xsd[1].length<2){
????? value = value.toString()+"0";??
???? }
???? return value;
??? }
?? }
?
?
1。固定小数位数统一格式
在网上搜的一个例子，转载过来以备后用，valueString 是指要转换的值，nAfterDotNum 为小数位数?????? var ValueString,nAfterDotNum ;
var resultStr,nTen;
ValueString = ""+ValueString+"";
strLen = ValueString.length;
dotPos = ValueString.indexOf(".",0);
if (dotPos == -1)
??????? {
resultStr = ValueString+".";
for (i=0;i<nAfterDotNum ;i++)
??????????????? {
resultStr = resultStr+"0";
??????? }
return resultStr;
}
else
??????? {
if ((strLen - dotPos - 1) >= nAfterDotNum ){
nAfter = dotPos + nAfterDotNum? + 1;
nTen =1;
for(j=0;j<nAfterDotNum ;j++){
nTen = nTen*10;
}
resultStr = Math.round(parseFloat(ValueString)*nTen)/nTen;
return resultStr;
}
else{
resultStr = ValueString;
for (i=0;i<(nAfterDotNum? - strLen + dotPos + 1);i++){
resultStr = resultStr+"0";
}
return resultStr;
}
}
}
