Use js to determine the byte length of a string (to distinguish between Chinese characters and English) @莫成尘

Look at the code first, just copy and use it. This is a more commonly used scenario. Chinese characters are treated as two characters, letters and numbers are treated as one character, and traditional Chinese characters are treated as three characters.

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This is a named function

	function getByteLength(str = '') {
    
    
	  let len = 0;
	  for (let i = 0; i < str.length; i++) {
    
    
	    if (str.charCodeAt(i) > 127 || str.charCodeAt(i) == 94) {
    
    
	      len += 2;
	    } else {
    
    
	      len++;
	    }
	  }
	  return len;
	}
	console.log(getByteLength('汉字汉字123')) //11

Of course, it can also be changed to an arrow function and used with elementui

（如果您单独使用需要您自己抽离代码）使用MessageBox 弹框组件

        this.$prompt('这是标题', {
    
    
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          inputPlaceholder: '输入不大于10个字符',//input框的提示
          inputErrorMessage: '字符数量错误或超出限制',//大于10个字符警告
          inputValidator: (value) => {
    
    
            let len = 0
            for (let i = 0; i < value.length; i++) {
    
    
              if (value.charCodeAt(i) > 127 || value.charCodeAt(i) == 94) {
    
    
                len += 2
              } else {
    
    
                len++
              }
            }
            if (len > 10) {
    
    
              return '字符数量错误或超出限制'
            } else if (/\s/.test(value)) {
    
     //不允许输入空格
              return '标题中不允许出现空格'
            }
            return true
          }
        }).then(({
    
     value }) => {
    
    
          if (value) {
    
     //处理value  就是您输入的值
            
          } else {
    
     //实际没什么用
            this.$notify({
    
    
              title: '失败',
              message: '请输入名称',
              type: 'error'
            })
          }
        }).catch(() => {
    
     //取消操作触发的事件
          this.$message({
    
    
            type: 'info',
            message: '取消输入'
          })
        })

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