在Nuxt中,我尝试使用retina.js来显示图像的@ 2x大小。它正在工作,但仅在刷新页面之后。控制台中甚至没有错误,只有正常大小的图像。这是我在nuxt.config.js中的插件:
plugins: [
{src: 'plugins/owl.js', ssr: false},
{src: 'plugins/retina.js'},
],
这是Retina.js插件:
(function() {
var root = (typeof exports === 'undefined' ? window : exports);
var config = {
// An option to choose a suffix for 2x images
retinaImageSuffix : '@2x',
// Ensure Content-Type is an image before trying to load @2x image
// https://github.com/imulus/retinajs/pull/45)
check_mime_type: true,
// Resize high-resolution images to original image's pixel dimensions
// https://github.com/imulus/retinajs/issues/8
force_original_dimensions: true
};
function Retina() {}
root.Retina = Retina;
Retina.configure = function(options) {
if (options === null) {
options = {};
}
for (var prop in options) {
if (options.hasOwnProperty(prop)) {
config[prop] = options[prop];
}
}
};
Retina.init = function(context) {
if (context === null) {
context = root;
}
var existing_onload = context.onload || function(){};
context.onload = function() {
var images = document.getElementsByTagName('img'), retinaImages = [], i, image;
for (i = 0; i < images.length; i += 1) {
image = images[i];
if (!!!image.getAttributeNode('data-no-retina')) {
retinaImages.push(new RetinaImage(image));
}
}
existing_onload();
};
};
Retina.isRetina = function(){
var mediaQuery = '(-webkit-min-device-pixel-ratio: 1.5), (min--moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-resolution: 1.5dppx)';
if (root.devicePixelRatio > 1) {
return true;
}
if (root.matchMedia && root.matchMedia(mediaQuery).matches) {
return true;
}
return false;
};
var regexMatch = /\.\w+$/;
function suffixReplace (match) {
return config.retinaImageSuffix + match;
}
function RetinaImagePath(path, at_2x_path) {
this.path = path || '';
if (typeof at_2x_path !== 'undefined' && at_2x_path !== null) {
this.at_2x_path = at_2x_path;
this.perform_check = false;
} else {
if (undefined !== document.createElement) {
var locationObject = document.createElement('a');
locationObject.href = this.path;
locationObject.pathname = locationObject.pathname.replace(regexMatch, suffixReplace);
this.at_2x_path = locationObject.href;
} else {
var parts = this.path.split('?');
parts[0] = parts[0].replace(regexMatch, suffixReplace);
this.at_2x_path = parts.join('?');
}
this.perform_check = true;
}
}
root.RetinaImagePath = RetinaImagePath;
RetinaImagePath.confirmed_paths = [];
RetinaImagePath.prototype.is_external = function() {
return !!(this.path.match(/^https?\:/i) && !this.path.match('//' + document.domain) );
};
RetinaImagePath.prototype.check_2x_variant = function(callback) {
var http, that = this;
if (this.is_external()) {
return callback(false);
} else if (!this.perform_check && typeof this.at_2x_path !== 'undefined' && this.at_2x_path !== null) {
return callback(true);
} else if (this.at_2x_path in RetinaImagePath.confirmed_paths) {
return callback(true);
} else {
http = new XMLHttpRequest();
http.open('HEAD', this.at_2x_path);
http.onreadystatechange = function() {
if (http.readyState !== 4) {
return callback(false);
}
if (http.status >= 200 && http.status <= 399) {
if (config.check_mime_type) {
var type = http.getResponseHeader('Content-Type');
if (type === null || !type.match(/^image/i)) {
return callback(false);
}
}
RetinaImagePath.confirmed_paths.push(that.at_2x_path);
return callback(true);
} else {
return callback(false);
}
};
http.send();
}
};
function RetinaImage(el) {
this.el = el;
this.path = new RetinaImagePath(this.el.getAttribute('src'), this.el.getAttribute('data-at2x'));
var that = this;
this.path.check_2x_variant(function(hasVariant) {
if (hasVariant) {
that.swap();
}
});
}
root.RetinaImage = RetinaImage;
RetinaImage.prototype.swap = function(path) {
if (typeof path === 'undefined') {
path = this.path.at_2x_path;
}
var that = this;
function load() {
if (! that.el.complete) {
setTimeout(load, 5);
} else {
if (config.force_original_dimensions) {
that.el.setAttribute('width', that.el.offsetWidth);
that.el.setAttribute('height', that.el.offsetHeight);
}
that.el.setAttribute('src', path);
}
}
load();
};
if (Retina.isRetina()) {
Retina.init(root);
}
})();
像在Nuxt中那样将retina.js作为插件运行甚至可以吗? 谢谢您的帮助!