字符串和数字处理--使用vue处理

使用ASCII处理字符串

ASCII码：
    [a-z]  97-122
    [A-Z]  65-90
    空格   32
    换行   10  

String.charCodeAt()  //获取字符的ASCII码
    toggle() {
      let newMsg = "";
      for (let i = 0; i < this.msg.length; i++) {
        let letter = this.msg[i];
        let asciiCode = letter.charCodeAt();
        if ((asciiCode >= 65 && asciiCode <= 90) || (asciiCode >= 97 && asciiCode <= 122) || asciiCode === 32) {
          newMsg += letter;
        }
      }
      console.log(newMsg);
    }

String.fromCharCode(ASCIICode)  //ASCII转字符
（将大写字母的 ASCII 码数值加上 32 便是其对应小写字母的 ASCII 码数值）
    lowLetter() {
      let newMsg = ""
      for(let i = 0; i < this.msg.length; i++) {
        let letter = this.msg[i]
        let asciiCode = letter.charCodeAt();
        if(asciiCode >= 65 && asciiCode <= 90) {
          newMsg += String.fromCharCode(asciiCode + 32)          
        }else{
          newMsg += letter
        }
      }
      console.log(newMsg)
    }

String.toLowerCase()  //字母转小写
String.split()  //字符分割
    words() {
      let newMsg = "";
      for (let i = 0; i < this.originText.length; i++) {
        let letter = this.originText[i]
        let asciiCode = letter.charCodeAt()
        if((asciiCode >= 65 && asciiCode <= 90) || (asciiCode >= 97 && asciiCode <= 122) || asciiCode === 32) {
          newMsg += letter
        }
      }
      let lowLetter = newMsg.toLowerCase()
      console.log("toLowerCase:",lowLetter)

      let words = lowLetter.split(' ')
      console.log("split:",`${words.length}个单词`)
    }

数字

Math.pow(base,exponent)  //幂运算
    base为底数，exponent为幂数

Math.log(x)  //以自然对数e为底的x的对数
    使用js计算非以e为底的对数结果
    function getBaseLog(base,x) {
      return Math.log(x) / Math.log()
    }