前端图片压缩(纯js)
html代码：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>localResizeIMG</title> <!--引入 lrz 插件 用于压缩图片--> <script type="text/javascript" src="lrz.bundle.js"></script> </head> <body> <input type="file" accept="image/jpeg" capture="camera" onchange="previewFile()"> </body> <script> function previewFile(){ /* 压缩图片 */ lrz(document.querySelector('input[type=file]').files[0], { quality: 0.4 //设置压缩率 }).then(function (rst) { /* 处理成功后执行 */ //rst.formData.append('base64img', rst.base64); // 添加额外参数 console.log(rst.file); //预览 let reader = new FileReader(); reader.readAsDataURL(rst.file); reader.onload = function(e) { var img = document.createElement("img"); img.style.width = '500px'; img.src = e.target.result; document.body.appendChild(img); } }).catch(function (err) { /* 处理失败后执行 */ }).always(function () { /* 必然执行 */ }) } </script> </html>
注：上面压缩后返回rst.file(是个Blob对象)可通过form表单直接传服务端,自定义文件名方式:
var form = new FormData(); // FormData 对象 form.append("file", rst.file, "file_"+Date.parse(new Date())+".jpg"); // 文件对象
lrz.bundle.js:
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CPU.+Mac OS X/.test(e), android: /Android/g.test(e), mQQBrowser: /MQQBrowser/g.test(e) } }(navigator.userAgent); r.prototype.init = function() { var e = this, t = e.file, n = "string" == typeof t, r = /^data:/.test(t), i = new Image, u = document.createElement("canvas"), l = n ? t : URL.createObjectURL(t); if(e.img = i, e.blob = l, e.canvas = u, n ? e.fileName = r ? "base64.jpg" : t.split("/").pop() : e.fileName = t.name, !document.createElement("canvas").getContext) throw new Error("浏览器不支持canvas"); return new a(function(n, a) { i.onerror = function() { var e = new Error("加载图片文件失败"); throw a(e), e }, i.onload = function() { e._getBase64().then(function(e) { if(e.length < 10) { var t = new Error("生成base64失败"); throw a(t), t } return e }).then(function(r) { var i = null; "object" == typeof e.file && r.length > e.file.size ? 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" + h(e, t, 4)), !1; var n, r, i, o, a, s = t + 6; if(18761 == e.getUint16(s)) n = !1; else { if(19789 != e.getUint16(s)) return p && console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)"), !1; n = !0 } if(42 != e.getUint16(s + 2, !n)) return p && console.log("Not valid TIFF data! (no 0x002A)"), !1; var u = e.getUint32(s + 4, !n); if(8 > u) return p && console.log("Not valid TIFF data! (First offset less than 8)", e.getUint32(s + 4, !n)), !1; if(r = f(e, s, s + u, y, n), r.ExifIFDPointer) { o = f(e, s, s + r.ExifIFDPointer, w, n); for(i in o) { switch(i) { case "LightSource": case "Flash": case "MeteringMode": case "ExposureProgram": case "SensingMethod": case "SceneCaptureType": case "SceneType": case "CustomRendered": case "WhiteBalance": case "GainControl": case "Contrast": case "Saturation": case "Sharpness": case "SubjectDistanceRange": case "FileSource": o[i] = S[i][o[i]]; break; case "ExifVersion": case "FlashpixVersion": o[i] = String.fromCharCode(o[i][0], o[i][1], o[i][2], o[i][3]); break; case "ComponentsConfiguration": o[i] = S.Components[o[i][0]] + S.Components[o[i][1]] + S.Components[o[i][2]] + S.Components[o[i][3]] } r[i] = o[i] } } if(r.GPSInfoIFDPointer) { a = f(e, s, s + r.GPSInfoIFDPointer, v, n); for(i in a) { switch(i) { case "GPSVersionID": a[i] = a[i][0] + "." + a[i][1] + "." + a[i][2] + "." + a[i][3] } r[i] = a[i] } } return r } var p = !1, m = function(e) { return e instanceof m ? e : this instanceof m ? void(this.EXIFwrapped = e) : new m(e) }; "undefined" != typeof e && e.exports && (t = e.exports = m), t.EXIF = m; var w = m.Tags = { 36864: "ExifVersion", 40960: "FlashpixVersion", 40961: "ColorSpace", 40962: "PixelXDimension", 40963: "PixelYDimension", 37121: "ComponentsConfiguration", 37122: "CompressedBitsPerPixel", 37500: "MakerNote", 37510: "UserComment", 40964: "RelatedSoundFile", 36867: "DateTimeOriginal", 36868: "DateTimeDigitized", 37520: "SubsecTime", 37521: "SubsecTimeOriginal", 37522: "SubsecTimeDigitized", 33434: "ExposureTime", 33437: "FNumber", 34850: "ExposureProgram", 34852: "SpectralSensitivity", 34855: "ISOSpeedRatings", 34856: "OECF", 37377: "ShutterSpeedValue", 37378: "ApertureValue", 37379: "BrightnessValue", 37380: "ExposureBias", 37381: "MaxApertureValue", 37382: "SubjectDistance", 37383: "MeteringMode", 37384: "LightSource", 37385: "Flash", 37396: "SubjectArea", 37386: "FocalLength", 41483: "FlashEnergy", 41484: "SpatialFrequencyResponse", 41486: "FocalPlaneXResolution", 41487: "FocalPlaneYResolution", 41488: "FocalPlaneResolutionUnit", 41492: "SubjectLocation", 41493: "ExposureIndex", 41495: "SensingMethod", 41728: "FileSource", 41729: "SceneType", 41730: "CFAPattern", 41985: "CustomRendered", 41986: "ExposureMode", 41987: "WhiteBalance", 41988: "DigitalZoomRation", 41989: "FocalLengthIn35mmFilm", 41990: "SceneCaptureType", 41991: "GainControl", 41992: "Contrast", 41993: "Saturation", 41994: "Sharpness", 41995: "DeviceSettingDescription", 41996: "SubjectDistanceRange", 40965: "InteroperabilityIFDPointer", 42016: "ImageUniqueID" }, y = m.TiffTags = { 256: "ImageWidth", 257: "ImageHeight", 34665: "ExifIFDPointer", 34853: "GPSInfoIFDPointer", 40965: "InteroperabilityIFDPointer", 258: "BitsPerSample", 259: "Compression", 262: "PhotometricInterpretation", 274: "Orientation", 277: "SamplesPerPixel", 284: "PlanarConfiguration", 530: "YCbCrSubSampling", 531: "YCbCrPositioning", 282: "XResolution", 283: "YResolution", 296: "ResolutionUnit", 273: "StripOffsets", 278: "RowsPerStrip", 279: "StripByteCounts", 513: "JPEGInterchangeFormat", 514: "JPEGInterchangeFormatLength", 301: "TransferFunction", 318: "WhitePoint", 319: "PrimaryChromaticities", 529: "YCbCrCoefficients", 532: "ReferenceBlackWhite", 306: "DateTime", 270: "ImageDescription", 271: "Make", 272: "Model", 305: "Software", 315: "Artist", 33432: "Copyright" }, v = m.GPSTags = { 0: "GPSVersionID", 1: "GPSLatitudeRef", 2: "GPSLatitude", 3: "GPSLongitudeRef", 4: "GPSLongitude", 5: "GPSAltitudeRef", 6: "GPSAltitude", 7: "GPSTimeStamp", 8: "GPSSatellites", 9: "GPSStatus", 10: "GPSMeasureMode", 11: "GPSDOP", 12: "GPSSpeedRef", 13: "GPSSpeed", 14: "GPSTrackRef", 15: "GPSTrack", 16: "GPSImgDirectionRef", 17: "GPSImgDirection", 18: "GPSMapDatum", 19: "GPSDestLatitudeRef", 20: "GPSDestLatitude", 21: "GPSDestLongitudeRef", 22: "GPSDestLongitude", 23: "GPSDestBearingRef", 24: "GPSDestBearing", 25: "GPSDestDistanceRef", 26: "GPSDestDistance", 27: "GPSProcessingMethod", 28: "GPSAreaInformation", 29: "GPSDateStamp", 30: "GPSDifferential" }, S = m.StringValues = { ExposureProgram: { 0: "Not defined", 1: "Manual", 2: "Normal program", 3: "Aperture priority", 4: "Shutter priority", 5: "Creative program", 6: "Action program", 7: "Portrait mode", 8: "Landscape mode" }, MeteringMode: { 0: "Unknown", 1: "Average", 2: "CenterWeightedAverage", 3: "Spot", 4: "MultiSpot", 5: "Pattern", 6: "Partial", 255: "Other" }, LightSource: { 0: "Unknown", 1: "Daylight", 2: "Fluorescent", 3: "Tungsten (incandescent light)", 4: "Flash", 9: "Fine weather", 10: "Cloudy weather", 11: "Shade", 12: "Daylight fluorescent (D 5700 - 7100K)", 13: "Day white fluorescent (N 4600 - 5400K)", 14: "Cool white fluorescent (W 3900 - 4500K)", 15: "White fluorescent (WW 3200 - 3700K)", 17: "Standard light A", 18: "Standard light B", 19: "Standard light C", 20: "D55", 21: "D65", 22: "D75", 23: "D50", 24: "ISO studio tungsten", 255: "Other" }, Flash: { 0: "Flash did not fire", 1: "Flash fired", 5: "Strobe return light not detected", 7: "Strobe return light detected", 9: "Flash fired, compulsory flash mode", 13: "Flash fired, compulsory flash mode, return light not detected", 15: "Flash fired, compulsory flash mode, return light detected", 16: "Flash did not fire, compulsory flash mode", 24: "Flash did not fire, auto mode", 25: "Flash fired, auto mode", 29: "Flash fired, auto mode, return light not detected", 31: "Flash fired, auto mode, return light detected", 32: "No flash function", 65: "Flash fired, red-eye reduction mode", 69: "Flash fired, red-eye reduction mode, return light not detected", 71: "Flash fired, red-eye reduction mode, return light detected", 73: "Flash fired, compulsory flash mode, red-eye reduction mode", 77: "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected", 79: "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected", 89: "Flash fired, auto mode, red-eye reduction mode", 93: "Flash fired, auto mode, return light not detected, red-eye reduction mode", 95: "Flash fired, auto mode, return light detected, red-eye reduction mode" }, SensingMethod: { 1: "Not defined", 2: "One-chip color area sensor", 3: "Two-chip color area sensor", 4: "Three-chip color area sensor", 5: "Color sequential area sensor", 7: "Trilinear sensor", 8: "Color sequential linear sensor" }, SceneCaptureType: { 0: "Standard", 1: "Landscape", 2: "Portrait", 3: "Night scene" }, SceneType: { 1: "Directly photographed" }, CustomRendered: { 0: "Normal process", 1: "Custom process" }, WhiteBalance: { 0: "Auto white balance", 1: "Manual white balance" }, GainControl: { 0: "None", 1: "Low gain up", 2: "High gain up", 3: "Low gain down", 4: "High gain down" }, Contrast: { 0: "Normal", 1: "Soft", 2: "Hard" }, Saturation: { 0: "Normal", 1: "Low saturation", 2: "High saturation" }, Sharpness: { 0: "Normal", 1: "Soft", 2: "Hard" }, SubjectDistanceRange: { 0: "Unknown", 1: "Macro", 2: "Close view", 3: "Distant view" }, FileSource: { 3: "DSC" }, Components: { 0: "", 1: "Y", 2: "Cb", 3: "Cr", 4: "R", 5: "G", 6: "B" } }, b = { 120: "caption", 110: "credit", 25: "keywords", 55: "dateCreated", 80: "byline", 85: "bylineTitle", 122: "captionWriter", 105: "headline", 116: "copyright", 15: "category" }; m.getData = function(e, t) { return(e instanceof Image || e instanceof HTMLImageElement) && !e.complete ? !1 : (n(e) ? t && t.call(e) : s(e, t), !0) }, m.getTag = function(e, t) { return n(e) ? e.exifdata[t] : void 0 }, m.getAllTags = function(e) { if(!n(e)) return {}; var t, r = e.exifdata, i = {}; for(t in r) r.hasOwnProperty(t) && (i[t] = r[t]); return i }, m.pretty = function(e) { if(!n(e)) return ""; var t, r = e.exifdata, i = ""; for(t in r) r.hasOwnProperty(t) && (i += "object" == typeof r[t] ? r[t] instanceof Number ? t + " : " + r[t] + " [" + r[t].numerator + "/" + r[t].denominator + "]\r\n" : t + " : [" + r[t].length + " values]\r\n" : t + " : " + r[t] + "\r\n"); return i }, m.readFromBinaryFile = function(e) { return u(e) }, r = [], i = function() { return m }.apply(t, r), !(void 0 !== i && (e.exports = i)) }).call(this) }]) }); //# sourceMappingURL=lrz.bundle.js.map
