问题是，即使您声明为十六进制，jquery也会返回rgb(...)，所以我只添加了函数将十六进制转换为rgb:

The problem is that jquery returns rgb(...) even if you declare as HEX so i just added a function to translate hex to rgb:

function hex2rgb(hex) {
  return ['0x' + hex[1] + hex[2] | 0, '0x' + hex[3] + hex[4] | 0, '0x' + hex[5] + hex[6] | 0];
}

不仅仅是修改您的代码:

and than just adapted your code:

$(document).ready(function (e) {

    // Color to change
    var targetHex = hex2rgb('#eb2c33');

    $('body *').each(function(index) {         
        var rgbg = $(this).css('background-color');

        if(rgbg == 'rgb('+targetHex[0]+', '+targetHex[1]+', '+targetHex[2]+')'){
            $(this).addClass('jcbg');
        }

    });
});

这是小提琴