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console 命令行工具 X clear 

                    

                        
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console

            
window.onload = function() {
  const text = `hello world/nzhangli`
  const blob = new Blob([text], {type: 'text/html,charset=UTF-8'})
  document.querySelector("#getData").href = URL.createObjectURL(blob)
}

            
<a download="data.txt" id="getData">下载</a>