Javascript格式化

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Javascript格式化

1. 单位数前补0

function formatNumber(n) {
  n = n.toString()
  return n[1] ? n : '0' + n
}

formatNumber(14); // '14'
formatNumber(2); // '02'

2. 日期格式化

function formatDate(date) {
  var year = date.getFullYear()
  var month = date.getMonth() + 1
  var day = date.getDate()

  var hour = date.getHours()
  var minute = date.getMinutes()
  var second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

formatDate(new Date()); // '2019/10/24 17:58:29'

3. 价格格式化

function formatPrice(price){
  var result = [];
  var revArr = String(price).split('').reverse();//整数部分倒序
  revArr.forEach(function(item,index){
    result.push(item);
    if((index+1)%3 === 0 && index!= revArr.length -1){
        result.push(',');
    }
  })
  return result.reverse().join('');
}

formatPrice(1234);   //1,234
formatPrice(12345);  //12,345
formatPrice(123467); //1,234,567