2022年记录（Vue）

1.子组件调用父组件的方法，并返回值

// 父组件
getdata(bounds, callback){
 callback(data)
}
// 子组件
let data = {}
this.$emit("getdata", bounds, val => {
    data = val
})
return data

2.Number类型转金额类型

//方法1
function numberFormat(number, decimals, dec_point, thousands_sep){
  number = (number + "").replace(/[^0-9+-Ee.]/g, "");
  var n = !isFinite(+number) ? 0 : +number,
  prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),//转换成绝对值
  sep = typeof thousands_sep === "undefined" ? "," : thousands_sep,
  dec = typeof dec_point === "undefined" ? "." : dec_point,
  s = "",
  toFixedFix = function(n, prec) {
    var k = Math.pow(10, prec);
    return "" + Math.floor(n * k) / k;
  };
  s = (prec ? toFixedFix(n, prec) : "" + Math.floor(n)).split(".");
  var re = /(-?\d+)(\d{3})/;
  console.log(s);
  while (re.test(s[0])) {
    s[0] = s[0].replace(re, "$1" + sep + "$2");
  }

  if ((s[1] || "").length < prec) {
    s[1] = s[1] || "";
    s[1] += new Array(prec - s[1].length + 1).join("0");
  }
  return s.join(dec);
}

//方法2
function numberFormat(value, decimals=2){
  const digitsRE = /(\d{3})(?=\d)/g;
  value = parseFloat(value);
  if (!value && value !== 0) return '';
  const stringified = Math.abs(value).toFixed(decimals);
  const $int = decimals ? stringified.slice(0, -1 - decimals) : stringified;
  const i = $int.length % 3;
  const head = i > 0 ? ($int.slice(0, i) + ($int.length > 3 ? ',' : '')) : '';
  const $float = decimals ? stringified.slice(-1 - decimals) : '';
  const sign = value < 0 ? '-' : '';
  return `${sign}${head}${$int.slice(i).replace(digitsRE, '$1,')}${$float} `;
}