字符串操作 | howcode

# 生成随机字符串

export const randomString = (len) => {
    let chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz123456789';
    let strLen = chars.length;
    let randomStr = '';
    for (let i = 0; i < len; i++) {
        randomStr += chars.charAt(Math.floor(Math.random() * strLen));
    }
    return randomStr;
};

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# 生成随机颜色

export const randomColor= () =>{
	let str = "#";
    let random = 0;
    let aryNum = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];
    for(let i = 0; i < 6; i++) {
        random = parseInt(Math.random() * 16);
        str += aryNum[random];
    }
    return str;
}

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# 字符串首字母大写

export const fistLetterUpper = (str) => {
    return str.charAt(0).toUpperCase() + str.slice(1);
};

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# 手机号中间四位变成*

export const telFormat = (tel) => {
  	tel = String(tel); 
    return tel.substr(0,3) + "****" + tel.substr(7);
};

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# 驼峰命名转换成短横线命名

export const getKebabCase = (str) => {
    return str.replace(/[A-Z]/g, (item) => '-' + item.toLowerCase())
}

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# 短横线命名转换成驼峰命名

export const getCamelCase = (str) => {
    return str.replace( /-([a-z])/g, (i, item) => item.toUpperCase())
}

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# 全角转换为半角

export const toCDB = (str) => {
  let result = "";
  for (let i = 0; i < str.length; i++) {
    code = str.charCodeAt(i);
    if (code >= 65281 && code <= 65374) {
      result += String.fromCharCode(str.charCodeAt(i) - 65248);
    } else if (code == 12288) {
      result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
    } else {
      result += str.charAt(i);
    }
  }
  return result;
}

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# 半角转换为全角

export const toDBC = (str) => {
  let result = "";
  for (let i = 0; i < str.length; i++) {
    code = str.charCodeAt(i);
    if (code >= 33 && code <= 126) {
      result += String.fromCharCode(str.charCodeAt(i) + 65248);
    } else if (code == 32) {
      result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
    } else {
      result += str.charAt(i);
    }
  }
  return result;
}

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# 判断字符串是否为空

export const isEmptyString = (string) =>{
	if (string == undefined ||
		typeof string == "undefined" ||
		!string ||
		string == null ||
		string == '' ||
		/^\s+$/gi.test(string)) {
		return true;
	} else {
		return false;
	}
}

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