常用工具函数

1. 将整数部分逢三一断

　　参数.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,') 

 

2. 金额只保留小数点后三位

　　参数.toString().substring(0,value.lastIndexOf('.')+4)

3. 获取地址栏参数

function getQueryString(name) {
　　if (window.location.href.indexOf("?") != window.location.href.lastIndexOf("?"))
　　var urls = window.location.href.replace(/\?/g, "&").replace(/^.*?&/, "")
　　else
　　var urls = window.location.href.replace(/^.*\?/, "");
　　var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
　　var r = ("?" + urls).substr(1).match(reg);
　　if (r != null) return unescape(r[2]);
　　return null;
}

 4. 获得输入框中字符长度

function getStringLength(val) {
  var str = new String(val)
  var bytesCount = 0
  for (var i = 0 ,n = str.length; i < n; i++) {
      var c = str.charCodeAt(i)
      if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
          bytesCount += 1
      } else {
          bytesCount += 2
      }
  }
  return bytesCount
}

 5. 正则 —— 汉字、字母、数字

　　参数.match(/^[A-Za-z0-9\u4e00-\u9fa5]+$/gi)

6. 时间格式转换

/**
 * 时间格式转换 YYYY-MM-DD
 * @param date 时间对象
 * @param type 返回时间格式
 */
const timeFormat = (dateObj, type) => {
  if (!(dateObj instanceof Date)) {
    throw new Error('参数dateObj不是Date实例')
  }
  let year = dateObj.getFullYear()
  let month = ('00' + (dateObj.getMonth() + 1)).slice(-2)
  let date = ('00' + dateObj.getDate()).slice(-2)
  let hours = ('00' + dateObj.getHours()).slice(-2)
  let minutes = ('00' + dateObj.getMinutes()).slice(-2)
  let seconds = ('00' + dateObj.getSeconds()).slice(-2)
  let timeString = ''
  let _type = type || 'YYYY-MM-DD'

  switch (_type) {
    case 'YYYY-MM-DD HH:MM:SS':
      timeString = `${year}-${month}-${date} ${hours}:${minutes}:${seconds}`
      break
    case 'YYYY-MM-DD HH:MM':
      timeString = `${year}-${month}-${date} ${hours}:${minutes}`
      break
    case 'YYYY-MM-DD':
      timeString = `${year}-${month}-${date}`
      break
    case 'MM-DD HH:MM':
      timeString = `${month}-${date} ${hours}:${minutes}`
      break
    case 'HH:MM:SS':
      timeString = `${hours}:${minutes}:${seconds}`
      break
    case 'HH:MM':
      timeString = `${hours}:${minutes}`
      break
    default:
      break
  }
  return timeString
}