数字处理

保留小数位数

export default function roundToDecimal(num:number, decimalPlaces=2) {
    return +num.toFixed(decimalPlaces);
}

去除对象中的空元素

function removeEmpty(obj) {
  return Object.fromEntries(Object.entries(obj).filter(([_, v]) => v != null));
}

判断数据类型

是否是数字(判断字符串)

export function isNumeric(value) {
    return /^-?\\d+$/.test(value);
}
export function isNumeric(value:any) {
    return /^-?\\d+$/.test(value);
}

cleanObject

export const isFalsy = (value: unknown) => (value === 0 ? false : !value);

export const isVoid = (value: unknown) =>
  value === undefined || value === null || value === "";

export const cleanObject = (object?: { [key: string]: unknown }) => {
  // Object.assign({}, object)
  if (!object) {
    return {};
  }
  const result = { ...object };
  Object.keys(result).forEach((key) => {
    const value = result[key];
    if (isVoid(value)) {
      delete result[key];
    }
  });
  return result;
};

export const isFalsy = (value) => (value === 0 ? false : !value);

export const isVoid = (value) =>
  value === undefined || value === null || value === "";

export const cleanObject = (object) => {
  // Object.assign({}, object)
  if (!object) {
    return {};
  }
  const result = { ...object };
  Object.keys(result).forEach((key) => {
    const value = result[key];
    if (isVoid(value)) {
      delete result[key];
    }
  });
  return result;
};

let res=cleanObject({
    name:'',
    pageSize:10,
    page:1
})
console.log("res", res)

参数转换

对象转化为formData

/**
 * 对象转化为formdata
 * @param {Object} object
 */

 export function getFormData(object) {
    const formData = new FormData()
    Object.keys(object).forEach(key => {
        const value = object[key]
        if (Array.isArray(value)) {
            value.forEach((subValue, i) =>
                formData.append(key + `[${i}]`, subValue)
            )
        } else {
            formData.append(key, object[key])
        }
    })
    return formData
}

/**
 * 对象转化为formdata
 * @param {Object} object
 */

 export function getFormData(object: { [index: string]: any }) {
    const formData = new FormData()
    Object.keys(object).forEach(key => {
        const value = object[key]
        if (Array.isArray(value)) {
            value.forEach((subValue, i) =>
                formData.append(key + `[${i}]`, subValue)
            )
        } else {
            formData.append(key, object[key])
        }
    })
    return formData
}

对象转化为urlencode

/**
 * 对象转化为url参数
 * @param {*} obj
 */
export function getParams(obj) {
    return Object.keys(obj)
        .map(function(k) {
            return encodeURIComponent(k) + '=' + encodeURIComponent(obj[k])
        })
        .join('&')
}

export function getParams(obj:{[key:string]:any}) {
    return Object.keys(obj)
        .map(function(k) {
            return encodeURIComponent(k) + '=' + encodeURIComponent(obj[k])
        })
        .join('&')
}

url参数转化为对象