Javascript 来自数组的随机颜色
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Random Color From Array
提问by Tomelower
I'm looking to build something with JavaScript that will pick a random value (background-color) from an array of given hex colors and apply it to a given div element.
我希望用 JavaScript 构建一些东西,从给定的十六进制颜色数组中选择一个随机值(背景颜色)并将其应用于给定的 div 元素。
Anyone know a good way to do this? Nothing seems to be working for me but I'm not really a JS savvy person.
有人知道这样做的好方法吗?似乎没有什么对我有用,但我并不是一个真正精通 JS 的人。
回答by Austin Brunkhorst
How about this?
这个怎么样?
var rgb = [];
for(var i = 0; i < 3; i++)
rgb.push(Math.floor(Math.random() * 255));
myDiv.style.backgroundColor = 'rgb('+ rgb.join(',') +')';
If you want to constrict it to known colors, you can create an array of the colors and randomly select it like so.
如果您想将其限制为已知颜色,您可以创建一个颜色数组并像这样随机选择它。
var colors = ['red', 'green', 'blue', 'orange', 'yellow'];
myDiv.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
Update- Using the first method to apply to all .post-content.
更新- 使用第一种方法应用于所有.post-content.
var divs = document.querySelectorAll('.post-content');
for(var i = 0; i < divs.length; i++)
divs[i].style.backgroundColor = 'rgb('+ rgb.join(',') +')';
If you want to apply a random background to each .post-contentindividually, you would do this.
如果您想对每个.post-content单独应用随机背景,您可以这样做。
var divs = document.querySelectorAll('.post-content');
for(var i = 0; i < divs.length; i++) {
var rgb = [];
for(var i = 0; i < 3; i++)
rgb.push(Math.floor(Math.random() * 255));
divs[i].style.backgroundColor = 'rgb('+ rgb.join(',') +')';
}
Last Update- using jQuery, as you mentioned.
上次更新- 正如您所提到的,使用 jQuery。
var colors = ['red', 'green', 'blue', 'orange', 'yellow'];
$('.post-content').each(function() {
$(this).css('background-color', colors[Math.floor(Math.random() * colors.length)]);
});
回答by kennebec
This example returns a random item from any array, if you pass a non-falsey argument, it removes the item from the array.
此示例从任何数组中返回一个随机项,如果您传递一个非假参数,它将从数组中删除该项。
Array.prototype.getRandom= function(cut){
var i= Math.floor(Math.random()*this.length);
if(cut && i in this){
return this.splice(i, 1)[0];
}
return this[i];
}
//sample:
//样本:
var colors= ['aqua', 'black', 'blue', 'fuchsia', 'gray', 'green',
'lime', 'maroon', 'navy', 'olive', 'orange', 'purple', 'red',
'silver', 'teal', 'white', 'yellow'];
alert(colors.getRandom());
警报(颜色。getRandom());
回答by kiradotee
Not sure how well this goes performance wise, but if you're already using lodash it can be as simple as:
不确定这在性能方面有多好,但如果你已经在使用 lodash,它可以很简单:
// initialising array of colours
let colours = ['tomato', 'salmon', 'plum', 'olive', 'lime', 'chocolate']
// getting a random colour
colours = _.shuffle(colours); // you can shuffle it once, or every time
let hereIsTheColour = colours.pop() // gets the last colour from the shuffled array (also removes it from the array)

