js-代码简洁之路（四）

1、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;
}

2、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;
}

3、数字转换为大写金额

export const digitUppercase = (n) => {
    const fraction = ['角', '分'];
    const digit = [
        '零', '壹', '贰', '叁', '肆',
        '伍', '陆', '柒', '捌', '玖'
    ];
    const unit = [
        ['元', '万', '亿'],
        ['', '拾', '佰', '仟']
    ];
    n = Math.abs(n);
    let s = '';
    for (let i = 0; i < fraction.length; i++) {
        s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');
    }
    s = s || '整';
    n = Math.floor(n);
    for (let i = 0; i < unit[0].length && n > 0; i++) {
        let p = '';
        for (let j = 0; j < unit[1].length && n > 0; j++) {
            p = digit[n % 10] + unit[1][j] + p;
            n = Math.floor(n / 10);
        }
        s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
    }
    return s.replace(/(零.)*零元/, '元')
        .replace(/(零.)+/g, '零')
        .replace(/^整$/, '零元整');
};

4、数字转化为中文数字

export const intToChinese = (value) => {
 const str = String(value);
 const len = str.length-1;
 const idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿'];
 const num = ['零','一','二','三','四','五','六','七','八','九'];
 return str.replace(/([1-9]|0+)/g, ( $, $1, idx, full) => {
    let pos = 0;
    if($1[0] !== '0'){
      pos = len-idx;
      if(idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){
      	 return idxs[len-idx];
      }
     	return num[$1[0]] + idxs[len-idx];
    } else {
     	let left = len - idx;
     	let right = len - idx + $1.length;
     	if(Math.floor(right / 4) - Math.floor(left / 4) > 0){
      		pos = left - left % 4;
     	}
     	if( pos ){
      		return idxs[pos] + num[$1[0]];
     	} else if( idx + $1.length >= len ){
      		return '';
     	}else {
      		return num[$1[0]]
     	}
    }
   });
}

5、存储loalStorage

export const loalStorageSet = (key, value) => {
    if (!key) return;
    if (typeof value !== 'string') {
        value = JSON.stringify(value);
    }
    window.localStorage.setItem(key, value);
};

6、获取localStorage

export const loalStorageGet = (key) => {
    if (!key) return;
    return window.localStorage.getItem(key);
};

7、删除localStorage

export const loalStorageRemove = (key) => {
    if (!key) return;
    window.localStorage.removeItem(key);
};

8、存储sessionStorage

export const sessionStorageSet = (key, value) => {
  	if (!key) return;
    if (typeof value !== 'string') {
    		value = JSON.stringify(value);
    }
    window.sessionStorage.setItem(key, value)
};

9、获取sessionStorage

export const sessionStorageGet = (key) => {
  	if (!key) return;
    return window.sessionStorage.getItem(key)
};

10、删除sessionStorage

export const sessionStorageRemove = (key) => {
  	if (!key) return;
    window.sessionStorage.removeItem(key)
};

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