JS
/** * 货币，价格，保留两位数 * @param that * @param maxLen 保留数值的长度 */ function onlyDecimal(that, maxLen) { that.value = that.value.replace(/[^\d.]/g, ""); //清除"数字"和"."以外的字符 that.value = that.value.replace(/^\./g, ""); //验证第一个字符是数字 that.value = that.value.replace(/\.{2,}/g, "."); //只保留第一个, 清除多余的 that.value = that.value.replace(".", "$#$").replace(/\./g, "").replace("$#$", "."); that.value = that.value.replace(/^(\-)*(\d+)\.(\d\d).*$/, '$1$2.$3'); //只能输入两个小数 if (!(typeof maxLen == 'undefined' || maxLen == '' || maxLen == null) && that.value.length > maxLen) { var val = that.value; that.value = val.toString().substring(0, parseInt(maxLen)) } }html
<input type='text' onchange="onlyDecimal(this,5)" oninput="onlyDecimal(this,5)">