1. Small program settings:
At this time, everyone found that the overall tone of many websites, apps, and applets has all changed to gray. In fact, not all icons have been replaced with gray, but a property has been set in css
Just add css style
page {
-webkit-filter: grayscale(.95);
}
The global setting can be set in the app.wxss global style file. If it is controlled on a single page, it can be debugged on a single page
1. Website settings:
Just like the applet, just add css style
html {
filter: url("data:image/svg+xml;utf8,#grayscale");
-webkit-filter: grayscale(100%);
filter: grayscale(100%);
filter: gray;
filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
}But it is not compatible with ie10 and ie11 browsers. Need to call js
/*
* -- grayscale.js --
* Copyright (C) James Padolsey (http://james.padolsey.com)
* Download by http://www.jb51.net
*/
var grayscale = (function(){
var config = {
colorProps: ['color','backgroundColor','borderBottomColor','borderTopColor','borderLeftColor','borderRightColor','backgroundImage'],
externalImageHandler : {
/* Grayscaling externally hosted images does not work
- Use these functions to handle those images as you so desire */
/* Out of convenience these functions are also used for browsers
like Chrome that do not support CanvasContext.getImageData */
init : function(el, src) {
if (el.nodeName.toLowerCase() === 'img') {
// Is IMG element...
} else {
// Is background-image element:
// Default - remove background images
data(el).backgroundImageSRC = src;
el.style.backgroundImage = '';
}
},
reset : function(el) {
if (el.nodeName.toLowerCase() === 'img') {
// Is IMG element...
} else {
// Is background-image element:
el.style.backgroundImage = 'url(' + (data(el).backgroundImageSRC || '') + ')';
}
}
}
},
log = function(){
try { window.console.log.apply(console, arguments); }
catch(e) {};
},
isExternal = function(url) {
// Checks whether URL is external: 'CanvasContext.getImageData'
// only works if the image is on the current domain.
return (new RegExp('https?://(?!' + window.location.hostname + ')')).test(url);
},
data = (function(){
var cache = [0],
expando = 'data' + (+new Date());
return function(elem) {
var cacheIndex = elem[expando],
nextCacheIndex = cache.length;
if(!cacheIndex) {
cacheIndex = elem[expando] = nextCacheIndex;
cache[cacheIndex] = {};
}
return cache[cacheIndex];
};
})(),
desatIMG = function(img, prepare, realEl) {
// realEl is only set when img is temp (for BG images)
var canvas = document.createElement('canvas'),
context = canvas.getContext('2d'),
height = img.naturalHeight || img.offsetHeight || img.height,
width = img.naturalWidth || img.offsetWidth || img.width,
imgData;
canvas.height = height;
canvas.width = width;
context.drawImage(img, 0, 0);
try {
imgData = context.getImageData(0, 0, width, height);
} catch(e) {}
if (prepare) {
desatIMG.preparing = true;
// Slowly recurse through pixels for prep,
// :: only occurs on grayscale.prepare()
var y = 0;
(function(){
if (!desatIMG.preparing) { return; }
if (y === height) {
// Finished!
context.putImageData(imgData, 0, 0, 0, 0, width, height);
realEl ? (data(realEl).BGdataURL = canvas.toDataURL())
: (data(img).dataURL = canvas.toDataURL())
}
for (var x = 0; x < width; x++) {
var i = (y * width + x) * 4;
// Apply Monoschrome level across all channels:
imgData.data[i] = imgData.data[i+1] = imgData.data[i+2] =
RGBtoGRAYSCALE(imgData.data[i], imgData.data[i+1], imgData.data[i+2]);
}
y++;
setTimeout(arguments.callee, 0);
})();
return;
} else {
// If desatIMG was called without 'prepare' flag
// then cancel recursion and proceed with force! (below)
desatIMG.preparing = false;
}
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
var i = (y * width + x) * 4;
// Apply Monoschrome level across all channels:
imgData.data[i] = imgData.data[i+1] = imgData.data[i+2] =
RGBtoGRAYSCALE(imgData.data[i], imgData.data[i+1], imgData.data[i+2]);
}
}
context.putImageData(imgData, 0, 0, 0, 0, width, height);
return canvas;
},
getStyle = function(el, prop) {
var style = document.defaultView && document.defaultView.getComputedStyle ?
document.defaultView.getComputedStyle(el, null)[prop]
: el.currentStyle[prop];
// If format is #FFFFFF: (convert to RGB)
if (style && /^#[A-F0-9]/i.test(style)) {
var hex = style.match(/[A-F0-9]{2}/ig);
style = 'rgb(' + parseInt(hex[0], 16) + ','
+ parseInt(hex[1], 16) + ','
+ parseInt(hex[2], 16) + ')';
}
return style;
},
RGBtoGRAYSCALE = function(r,g,b) {
// Returns single monochrome figure:
return parseInt( (0.2125 * r) + (0.7154 * g) + (0.0721 * b), 10 );
},
getAllNodes = function(context) {
var all = Array.prototype.slice.call(context.getElementsByTagName('*'));
all.unshift(context);
return all;
};
var init = function(context) {
// Handle if a DOM collection is passed instead of a single el:
if (context && context[0] && context.length && context[0].nodeName) {
// Is a DOM collection:
var allContexts = Array.prototype.slice.call(context),
cIndex = -1, cLen = allContexts.length;
while (++cIndex<cLen) { init.call(this, allContexts[cIndex]); }
return;
}
context = context || document.documentElement;
if (!document.createElement('canvas').getContext) {
context.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)';
context.style.zoom = 1;
return;
}
var all = getAllNodes(context),
i = -1, len = all.length;
while (++i<len) {
var cur = all[i];
if (cur.nodeName.toLowerCase() === 'img') {
var src = cur.getAttribute('src');
if(!src) { continue; }
if (isExternal(src)) {
config.externalImageHandler.init(cur, src);
} else {
data(cur).realSRC = src;
try {
// Within try statement just encase there's no support....
cur.src = data(cur).dataURL || desatIMG(cur).toDataURL();
} catch(e) { config.externalImageHandler.init(cur, src); }
}
} else {
for (var pIndex = 0, pLen = config.colorProps.length; pIndex < pLen; pIndex++) {
var prop = config.colorProps[pIndex],
style = getStyle(cur, prop);
if (!style) {continue;}
if (cur.style[prop]) {
data(cur)[prop] = style;
}
// RGB color:
if (style.substring(0,4) === 'rgb(') {
var monoRGB = RGBtoGRAYSCALE.apply(null, style.match(/\d+/g));
cur.style[prop] = style = 'rgb(' + monoRGB + ',' + monoRGB + ',' + monoRGB + ')';
continue;
}
// Background Image:
if (style.indexOf('url(') >-1) {
var urlPatt = /\(['"]?(.+?)['"]?\)/,
url = style.match(urlPatt)[1];
if (isExternal(url)) {
config.externalImageHandler.init(cur, url);
data(cur).externalBG = true;
continue;
}
// data(cur).BGdataURL refers to caches URL (from preparation)
try {
var imgSRC = data(cur).BGdataURL || (function(){
var temp = document.createElement('img');
temp.src = url;
return desatIMG(temp).toDataURL();
})();
cur.style[prop] = style.replace(urlPatt, function(_, url){
return '(' + imgSRC + ')';
});
} catch(e) { config.externalImageHandler.init(cur, url); }
}
}
}
}
};
init.reset = function(context) {
// Handle if a DOM collection is passed instead of a single el:
if (context && context[0] && context.length && context[0].nodeName) {
// Is a DOM collection:
var allContexts = Array.prototype.slice.call(context),
cIndex = -1, cLen = allContexts.length;
while (++cIndex<cLen) { init.reset.call(this, allContexts[cIndex]); }
return;
}
context = context || document.documentElement;
if (!document.createElement('canvas').getContext) {
context.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayscale=0)';
return;
}
var all = getAllNodes(context),
i = -1, len = all.length;
while (++i<len) {
var cur = all[i];
if (cur.nodeName.toLowerCase() === 'img') {
var src = cur.getAttribute('src');
if (isExternal(src)) {
config.externalImageHandler.reset(cur, src);
}
cur.src = data(cur).realSRC || src;
} else {
for (var pIndex = 0, pLen = config.colorProps.length; pIndex < pLen; pIndex++) {
if (data(cur).externalBG) {
config.externalImageHandler.reset(cur);
}
var prop = config.colorProps[pIndex];
cur.style[prop] = data(cur)[prop] || '';
}
}
}
};
init.prepare = function(context) {
// Handle if a DOM collection is passed instead of a single el:
if (context && context[0] && context.length && context[0].nodeName) {
// Is a DOM collection:
var allContexts = Array.prototype.slice.call(context),
cIndex = -1, cLen = allContexts.length;
while (++cIndex<cLen) { init.prepare.call(null, allContexts[cIndex]); }
return;
}
// Slowly recurses through all elements
// so as not to lock up on the user.
context = context || document.documentElement;
if (!document.createElement('canvas').getContext) { return; }
var all = getAllNodes(context),
i = -1, len = all.length;
while (++i-1) {
var urlPatt = /\(['"]?(.+?)['"]?\)/,
url = style.match(urlPatt)[1];
if (!isExternal(url)) {
var temp = document.createElement('img');
temp.src = url;
desatIMG(temp, true, cur);
}
}
}
}
};
return init;
})();
When we are in ie10 and ie11 browsers, just call the js function of graystyle.
At this point, the graying out of the website is perfect. Perfectly compatible with various browsers, the author has used it in the production environment, so you can use it with confidence.
Friends who like it, quickly collect and use it!