html复制文本逻辑

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// 复制文本     function copyTxt(text) {         if (navigator.clipboard) {             navigator.clipboard.writeText(text)             $Sys.notify('复制成功')         } else if (document.execCommand) {             let input = document.createElement('input')             // 设置内容             input.value = text             // 添加临时实例             document.body.appendChild(input)             // 选择实例内容             input.select()             document.execCommand('copy')             document.body.removeChild(input)             $Sys.notify('复制成功')         }     }