下载方法
let a = document.createElement("a"); a.setAttribute('download', "") let fileReader = new FileReader(); let fileInput = document.getElementById("file"); fileInput.onchange = function (e) { let file = e.target.files[0]; fileReader.readAsDataURL(file); fileReader.onload = function () { let img = new Image(); let fileUrl = fileReader.result; a.href = fileUrl; a.click(); }; };

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