当我在Facebook上,并且控制台打开时,我看到下面的图像.他们怎么做到这一点
解决方法
就像在Firebug中一样,您可以使用％c来设计控制台日志输出.看看我们如何实现Facebook的例子：
console.log("%cStop!","color: red; font-family: sans-serif; font-size: 4.5em; font-weight: bolder; text-shadow: #000 1px 1px;");
(function(url) {
// Create a new `Image` instance
var image = new Image();
image.onload = function() {
// Inside here we already have the dimensions of the loaded image
var style = [
// Hacky way of forcing image's viewport using `font-size` and `line-height`
'font-size: 1px;','line-height: ' + this.height + 'px;',// Hacky way of forcing a middle/center anchor point for the image
'padding: ' + this.height * .5 + 'px ' + this.width * .5 + 'px;',// Set image dimensions
'background-size: ' + this.width + 'px ' + this.height + 'px;',// Set image URL
'background: url('+ url +');'
].join(' ');
console.log('%c',style);
};
// Actually loads the image
image.src = url;
})('https://i.cloudup.com/Zqeq2GhGjt-3000x3000.jpeg');
