正则：文本框只能输入数字，最多4位小数

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正则：文本框只能输入数字，最多4位小数

<script type="text/javascript">function _v(str){var v4 = /^[+-]?\d+\.\d{0,4}$/i;return v4.test(str);}document.writeln("1.1111:"+_v("1.1111"));//truedocument.writeln("<br />");document.writeln("1.111:"+_v("1.111"));//truedocument.writeln("<br />");document.writeln("1.11:"+_v("1.11"));//truedocument.writeln("<br />");document.writeln("1.1:"+_v("1.1"));//truedocument.writeln("<br />");document.writeln("11.1:"+_v("11.1"));//truedocument.writeln("<br />");document.writeln("111.1:"+_v("111.1"));//truedocument.writeln("<br />");document.writeln("1111.1:"+_v("1111.1"));//truedocument.writeln("<br />");document.writeln("1.11111:"+_v("1.11111"));//falsedocument.writeln("<br />");document.writeln("58.62596:"+_v("58.62596"));//falsedocument.writeln("<br />");document.writeln("58.6260:"+_v("58.6260"));//truedocument.writeln("<br />");document.writeln("1.1.11.:"+_v("1.1.11."));//false</script>

1.1111:true
1.111:true
1.11:true
1.1:true
11.1:true
111.1:true
1111.1:true
1.11111:false
58.62596:false
58.6260:true
1.1.11.:false