执行if语句的更好方法
执行if语句的更好方法
提问于 2017-08-16 21:53:11
我正在努力提高我的一些JS技能。
我有一些十六进制的颜色，这些颜色在一个对象中存储为前景色和背景色。
当网页的宽度是一个特定的大小时，我希望确保不会使用对象中的某些特定颜色来更改文本颜色。
这就是我到目前为止所拥有的。这是有效的，我知道我也可以使用一个开关，但是其他人可以改善if || statemenent吗? fine...and。
var colorThemes = [
// Combo 1:
{ foreground: "#0A1C6B", background: "#5DF0AD" },
// Combo 2:
{ foreground: "#C2F5FF", background: "#0A1C6B" },
// Combo 3:
{ foreground: "#583985", background: "#CCCCF0" },
// Combo 4:
{ foreground: "#FBBEA6", background: "#5839B5" },
// Combo 5:
{ foreground: "#8A350D", background: "#FFDB0D" }
]
var randomnumber = Math.floor((Math.random() * colorThemes.length));
var selector = colorThemes[randomnumber]
if (selector.foreground === "#0A1C6B" || selector.foreground === "#5DF0AD" || selector.foreground === "#C2F5FF" || selector.foreground === "#ABD1fA" || selector.foreground === "#FBBEA6" || selector.foreground === "#FACCD4" || selector.foreground === "#FF5919" || selector.foreground === "#D9F2AD" || selector.foreground === "#83BF25"){
copyCount[i].style.color = selector.background;
}
}'谢谢你
回答 4
Stack Overflow用户
回答已采纳
发布于 2017-08-16 21:59:14
您可以尝试使用Array#filter
if (colorThemes.filter(a => (selector.foreground === a.foreground|| selector.foreground == a.background)).length > 0) {
copyCount[i].style.color = selector.background;
} }Stack Overflow用户
发布于 2017-08-16 21:56:01
您可以创建一个包含所有颜色的数组，然后检查选定的颜色是否包含在此数组中。
const colorThemes = [
{ foreground: "#0A1C6B", background: "#5DF0AD" },
{ foreground: "#C2F5FF", background: "#0A1C6B" },
{ foreground: "#583985", background: "#CCCCF0" },
{ foreground: "#FBBEA6", background: "#5839B5" },
{ foreground: "#8A350D", background: "#FFDB0D" }
]
const colors = colorThemes.reduce((acc, curr) => {
acc.push(curr.foreground, curr.background);
return acc;
}, []);
const randomnumber = Math.floor((Math.random() * colorThemes.length));
const selector = colorThemes[randomnumber]
if (colors.includes(selector.foreground)) {
console.log('Success');
}
Stack Overflow用户
发布于 2017-08-16 22:01:37
您可以使用带有颜色数组的Array#indexOf。
var colorThemes = [{ foreground: "#0A1C6B", background: "#5DF0AD" }, { foreground: "#C2F5FF", background: "#0A1C6B" }, { foreground: "#583985", background: "#CCCCF0" }, { foreground: "#FBBEA6", background: "#5839B5" }, { foreground: "#8A350D", background: "#FFDB0D" }],
randomnumber = Math.floor(Math.random() * colorThemes.length),
selector = colorThemes[randomnumber],
changeColors = ["#0A1C6B", "#5DF0AD", "#C2F5FF", "#ABD1fA", "#FBBEA6", "#FACCD4", "#FF5919", "#D9F2AD", "#83BF25"];
if (changeColors.indexOf(selector.foreground) !== -1) {
console.log('change color!');
//copyCount[i].style.color = selector.background;
}
对于ES6，您可以使用Set表示颜色
var colorThemes = [{ foreground: "#0A1C6B", background: "#5DF0AD" }, { foreground: "#C2F5FF", background: "#0A1C6B" }, { foreground: "#583985", background: "#CCCCF0" }, { foreground: "#FBBEA6", background: "#5839B5" }, { foreground: "#8A350D", background: "#FFDB0D" }],
randomnumber = Math.floor(Math.random() * colorThemes.length),
selector = colorThemes[randomnumber],
colorSet = new Set(["#0A1C6B", "#5DF0AD", "#C2F5FF", "#ABD1fA", "#FBBEA6", "#FACCD4", "#FF5919", "#D9F2AD", "#83BF25"]);
if (colorSet.has(selector.foreground)) {
console.log('change color!');
//copyCount[i].style.color = selector.background;
} else {
console.log('nothing has changed!');
}
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原文链接：
https://stackoverflow.com/questions/45715489
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