关于vue.js:vue-中-输入框只能输入固定位数的小数处理方法备忘

<a-input @input="FC.numDxsCheck(form, 2, 'name')" v-model="form.name" :maxLength="50" placeholder="请输出" />

/** *  带小数点的数字输出 - 默认4为小数 *  例如：FC.numDxsCheck(form, 3,'phone') *  form:表单对象，其中包含phone *  ws:几位小数 *  key:键名不叫phone时须要传入新的键名 * */export function numDxsCheck(form, ws, key){  if(key === undefined){    key = "cost";  }  form[key] = form[key] + "";  //先把非数字的都替换掉，除了数字和.  form[key] = form[key].replace(/[^\d.]/g,"");  //必须保障第一个为数字而不是.  form[key] = form[key].replace(/^\./g,"");  //保障只有呈现一个.而没有多个.  form[key] = form[key].replace(/\.{2,}/g,".");  //保障.只呈现一次，而不能呈现两次以上  form[key] = form[key].replace(".","$#$").replace(/\./g,"").replace("$#$",".");  //只能输出4个小数  let c = null;  switch(ws) {    case 1:      c = /^(\-)*(\d+)\.(\d).*$/;    case 2:      c = /^(\-)*(\d+)\.(\d\d).*$/;      break;    case 3:      c = /^(\-)*(\d+)\.(\d\d\d).*$/;      break;    case 4:      c = /^(\-)*(\d+)\.(\d\d\d\d).*$/;      break;    default:      c = /^(\-)*(\d+)\.(\d\d).*$/;  }  //只能输出两个小数  form[key] = form[key].replace(c,'$1$2.$3');}