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102 lines
4.0 KiB
102 lines
4.0 KiB
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<title>Page Title</title>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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<body>
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<input id="files" type="file" multiple />
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<h4 id="t1"></h4>
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<img id="img01" src="" alt="">
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<canvas id="can"></canvas>
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<h4 id="t2"></h4>
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<img id="img02" src="" alt="">
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<script>
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let input = document.getElementById("files")
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let img01 = document.getElementById("img01")
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let img02 = document.getElementById("img02")
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input.addEventListener('change', function() {
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console.log(this.files[0]);
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let files = this.files
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let img = new Image()
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let count = 0
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img.src = URL.createObjectURL(this.files[0])
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img.onload = function() {
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console.log(this);
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let _canvas = document.getElementById("can")
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//处理缩放
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let w = this.width
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let h = this.height
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_canvas.setAttribute("width", w)
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_canvas.setAttribute("height", h)
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_canvas.getContext("2d").drawImage(this, 0, 0, w, h)
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//转格式
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console.log(_canvas);
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//输出100%质量
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_canvas.toBlob(function(blob) {
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console.log(blob, '完成0.81');
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let size = 1024 * 100 //预设值
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size = size - 4000 //默认簇
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let skip = 0.01 //变化幅度
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let maxSize = blob.size //1压缩
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//先预判图片压缩后的大小再微调
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let yu = size > maxSize ? 0.81 * 0.81 : 0.81
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let startQu = size / maxSize * yu
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if (startQu >= 1) startQu = 0.99
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if (startQu <= 0) startQu = 0.01
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setSizeFun(size, startQu.toFixed(2) - 0)
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function setSizeFun(setSize, qu) {
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_canvas.toBlob(function(blob22) {
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console.log('count:', count++);
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// let isLess = blob22.size < setSize
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console.log(blob22, qu, '继续');
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img02.src = URL.createObjectURL(blob22)
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let bSize = blob22.size
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//符合条件区间
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if (bSize > setSize * 0.9 && bSize < setSize) {
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console.log(blob22, URL.createObjectURL(blob22), qu, '完成✅✅✅');
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return
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}
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//原图太小，
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if (qu >= 0.95 && bSize < setSize) {
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console.warn(blob22, qu, URL.createObjectURL(blob22), '最大输出✅');
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return
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}
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//压缩不到制定的大小
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if (qu < 0.0001 && bSize > setSize) {
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console.error(blob22, qu, URL.createObjectURL(blob22), '没有符合的🙅');
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return
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}
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if (qu < 0.0001 && bSize < setSize) {
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console.warn(blob22, qu, URL.createObjectURL(blob22), '最小输出✅');
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return
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}
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//微调
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if (bSize < setSize) {
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qu = qu + skip
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} else {
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qu = qu - skip
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}
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setSizeFun(setSize, qu.toFixed(2) - 0)
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}, `image/webp`, qu)
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}
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}, `image/webp`, 0.81)
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}
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}, false)
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</script>
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</body>
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</html> |