Question

我有这种格式的RGBA颜色：

RGBA:1.000000,0.003922,0.003922,0.003922

如何将每个值与此字符串分开，例如：

var alpha = 1.000000;
var red = 0.003922;
var green = 0.003922;
var blue = 0.003922;

我想在javascript中执行此操作。

Answer 1

没有必要使用jQuery。这是一个相当简单的JavaScript操作。最简单的方法是使用String.prototype.split()方法：

var rgba = '1.000000,0.003922,0.003922,0.003922'.split(',');

console.log(rgba[0]);  // "1.000000"
console.log(rgba[1]);  // "0.003922"
console.log(rgba[2]);  // "0.003922"
console.log(rgba[3]);  // "0.003922"

要获取数字而不是字符串，您可以使用parseFloat()或快捷+技巧：

var red = parseFloat(rgba[0]);  // 1.000000
var green = +rgba[1];           // 0.003922

如果您的字符串包含额外数据，您可以先使用replace()删除它：

var str = 'RGBA:1.000000,0.003922,0.003922,0.003922'.replace('RGBA:', ''),
    rgba = str.split(',');

或使用regular expression来匹配数字：

var rgba = 'RGBA:1.000000,0.003922,0.003922,0.003922'.match(/\d+\.\d+/g);
>> ["1.000000", "0.003922", "0.003922", "0.003922"]

如何使用javascript从字符串中获取字符串的特定部分？

1 个答案: