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Editor to share with you how to achieve the nine palace grid cut effect of canvas in JavaScript. I hope you will get something after reading this article. Let's discuss it together.

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Document body {text-align: center;} canvas {border: 1px solid;} .newcanvas {width: 316px; height: 316px; margin: auto;} .newpohoto, .download {width: 300px Height: 40px; line-height: 40px; margin: auto; background-color: cornflowerblue; border-radius: 5px; cursor: pointer; margin: 10px auto; color: white } use canvas to achieve the effect of cutting images in the ninth palace. Start cutting and downloading pictures var canvas = document.getElementById ("mycnavas") / / now put the picture on var cxt = mycnavas.getContext ("2d"); var img = new Image (); img.src = ".. / img/img10.jpg"; _ window.onload = function () {cxt.drawImage (img, 0,0400,300); / / the position where the picture is drawn} var arr = [] / save the cut images in the array document.getElementsByClassName ("newpohoto") [0] .onclick = function () {var Q = 1; for (var I = 0; I < 3; iSense +) {for (var j = 0; j < 3; jacks +) {var data = cxt.getImageData (j * 100,100,400,100) / / similar to the "copy" function var img = document.getElementById ("img" + Q) var newcxt = img.getContext ("2d"); newcxt.putImageData (data, 0,0) / / two parameters of the similar "paste" function arr.push (console.log (img.toDataURL (Q + ".png")) / / toDataURL () method: DataURL (type, encoderOptions) type specifies the format of the image converted to base64 encoding, such as image/png, image/jpeg, image/webp, etc., which defaults to image/png format Qupload images; console.log (arr)} / / download cut images var arr = []; document.getElementsByClassName ('download') [0] .onclick = function () {for (var I = 0; I < 9) Var +) {var a = document.createElement ('a'); a.download = 'img' + (I + 1); a.href = arr [I]; document.body.appendChild (a); a.click () }} after reading this article, I believe you have a certain understanding of "how to achieve the nine-grid cut effect of canvas in JavaScript". If you want to know more about it, welcome to follow the industry information channel, thank you for reading!

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