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Martin Hope
SryForStupidQuestion
Asked: 2024-04-11 15:09:13 +0000 UTC
  • 8

我正在用 JS（客户端，没有 Node）编写一个简单的文本解析器。有一个Windows-1251编码（记事本中为ANSI）的txt文件，将其放入输入后会发生某种算法，用户必须返回下载具有完全相同编码的文件。实际问题是如何以 Windows-1251 编码保存文件。

我通过 FileReader 读取文本，如下所示：

reader.readAsText(file, 'windows-1251')

我执行onload所需的算法并将文本保存到变量中text

我用这个函数保存文件，指明编码windows-1251

function saveAsFile(fileName, data = '', postfix = (+(new Date)).toString()) {
   var lnk = document.createElement('a');
   lnk.href = `data:text/plain;charset=windows-1251;filename=${fileName},${UnicodeToWin1251(data)}`
   lnk.download = fileName;
   lnk.target = '_blank';
   lnk.style.display = 'none';
   lnk.id = `downloadlnk-${postfix}`;
   document.body.appendChild(lnk);
   lnk.click();
   document.body.removeChild(lnk);
}

文件以 UTF-8 编码保存。我认为问题可能出在文本本身的编码上，我发现这个函数可以将文本重新编码为所需的编码：

var DMap = {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 10: 10, 11: 11, 12: 12, 13: 13, 14: 14, 15: 15, 16: 16, 17: 17, 18: 18, 19: 19, 20: 20, 21: 21, 22: 22, 23: 23, 24: 24, 25: 25, 26: 26, 27: 27, 28: 28, 29: 29, 30: 30, 31: 31, 32: 32, 33: 33, 34: 34, 35: 35, 36: 36, 37: 37, 38: 38, 39: 39, 40: 40, 41: 41, 42: 42, 43: 43, 44: 44, 45: 45, 46: 46, 47: 47, 48: 48, 49: 49, 50: 50, 51: 51, 52: 52, 53: 53, 54: 54, 55: 55, 56: 56, 57: 57, 58: 58, 59: 59, 60: 60, 61: 61, 62: 62, 63: 63, 64: 64, 65: 65, 66: 66, 67: 67, 68: 68, 69: 69, 70: 70, 71: 71, 72: 72, 73: 73, 74: 74, 75: 75, 76: 76, 77: 77, 78: 78, 79: 79, 80: 80, 81: 81, 82: 82, 83: 83, 84: 84, 85: 85, 86: 86, 87: 87, 88: 88, 89: 89, 90: 90, 91: 91, 92: 92, 93: 93, 94: 94, 95: 95, 96: 96, 97: 97, 98: 98, 99: 99, 100: 100, 101: 101, 102: 102, 103: 103, 104: 104, 105: 105, 106: 106, 107: 107, 108: 108, 109: 109, 110: 110, 111: 111, 112: 112, 113: 113, 114: 114, 115: 115, 116: 116, 117: 117, 118: 118, 119: 119, 120: 120, 121: 121, 122: 122, 123: 123, 124: 124, 125: 125, 126: 126, 127: 127, 1027: 129, 8225: 135, 1046: 198, 8222: 132, 1047: 199, 1168: 165, 1048: 200, 1113: 154, 1049: 201, 1045: 197, 1050: 202, 1028: 170, 160: 160, 1040: 192, 1051: 203, 164: 164, 166: 166, 167: 167, 169: 169, 171: 171, 172: 172, 173: 173, 174: 174, 1053: 205, 176: 176, 177: 177, 1114: 156, 181: 181, 182: 182, 183: 183, 8221: 148, 187: 187, 1029: 189, 1056: 208, 1057: 209, 1058: 210, 8364: 136, 1112: 188, 1115: 158, 1059: 211, 1060: 212, 1030: 178, 1061: 213, 1062: 214, 1063: 215, 1116: 157, 1064: 216, 1065: 217, 1031: 175, 1066: 218, 1067: 219, 1068: 220, 1069: 221, 1070: 222, 1032: 163, 8226: 149, 1071: 223, 1072: 224, 8482: 153, 1073: 225, 8240: 137, 1118: 162, 1074: 226, 1110: 179, 8230: 133, 1075: 227, 1033: 138, 1076: 228, 1077: 229, 8211: 150, 1078: 230, 1119: 159, 1079: 231, 1042: 194, 1080: 232, 1034: 140, 1025: 168, 1081: 233, 1082: 234, 8212: 151, 1083: 235, 1169: 180, 1084: 236, 1052: 204, 1085: 237, 1035: 142, 1086: 238, 1087: 239, 1088: 240, 1089: 241, 1090: 242, 1036: 141, 1041: 193, 1091: 243, 1092: 244, 8224: 134, 1093: 245, 8470: 185, 1094: 246, 1054: 206, 1095: 247, 1096: 248, 8249: 139, 1097: 249, 1098: 250, 1044: 196, 1099: 251, 1111: 191, 1055: 207, 1100: 252, 1038: 161, 8220: 147, 1101: 253, 8250: 155, 1102: 254, 8216: 145, 1103: 255, 1043: 195, 1105: 184, 1039: 143, 1026: 128, 1106: 144, 8218: 130, 1107: 131, 8217: 146, 1108: 186, 1109: 190};

function UnicodeToWin1251(s) {
    var L = []
    for (var i=0; i<s.length; i++) {
        var ord = s.charCodeAt(i)
        if (!(ord in DMap))
            throw "Character "+s.charAt(i)+" isn't supported by win1251!"
        L.push(String.fromCharCode(DMap[ord]))
    }
    return L.join('')
}

通过它传递变量时，text文件也以 UTF-8 格式保存，但包含以下字符：“Àíàñòàñèÿ”

如何实现我需要的结果（不使用 Node 服务器、PHP 等）？

javascript
Martin Hope
SryForStupidQuestion
Asked: 2022-01-09 23:52:05 +0000 UTC
  • 1

有以下代码：

var a = Pane()
a.setPrefSize(200.0, 200.0)
a.style = "-fx-background-color: red"
a.setOnMouseClicked { 
    println("a")
}
var b = Pane()
b.setPrefSize(100.0, 100.0)
b.style = "-fx-background-color: green"
b.setOnMouseClicked {
    println("b")
}
a.children.addAll(b)
root.children.addAll(a)

单击子窗格时，不仅会触发其事件，还会触发父元素的事件。如何通过单击禁用此功能？

java
Martin Hope
SryForStupidQuestion
Asked: 2020-01-20 18:51:17 +0000 UTC
  • 2

开始学习 Java，但无法弄清楚继承是如何工作的。

有一个类继承自 Pane。

public class Tone extends Pane{

   int x = 100;
   int y = 100;
   Background skin = new Background(new BackgroundFill(Color.rgb(255, 255, 0), CornerRadii.EMPTY, Insets.EMPTY));

   Tone() {
       this.setPrefSize(this.x, this.y);
       this.setBackground(this.skin);
       this.setOnMouseEntered(e ->{
           show();
       });
       this.setOnMouseExited(e -> {
           show();
       });
   }

   void show() {
       if(this.getChildren().isEmpty()) {
           Text stat = new Text(this.x + " " + this.y);
           this.getChildren().add(stat);
       } 
       else {
           this.getChildren().clear();
       }
   }
}

另一个类继承自这个类，其中变量的值发生了变化。

public class Ttwo extends Tone {

   int x = 300;
   Background skin = new Background(new BackgroundFill(Color.rgb(255, 0, 0), CornerRadii.EMPTY, Insets.EMPTY));

}

创建对象时，Ttwo 不会更改其大小、显示值或背景颜色。

告诉我，错误是什么？

java