WHY

@if(0)==(0) echo off
cscript //nologo //e:jscript "%~f0" <  替换.txt
pause & goto :EOF
@end

var n = 1;
var fso = new ActiveXObject('Scripting.FileSystemObject');
var str = fso.OpenTextFile('work.txt', 1).ReadAll();

while(!WSH.StdIn.AtEndOfStream){
    var key1 = WSH.StdIn.ReadLine(), key2 = WSH.StdIn.ReadLine();
    var Len  = str.split(key1).length;
    if (Len < 2) {
        WSH.Echo('第' + n + '行 无\n' + key1);
    } else if (Len == 2) {
        str = str.replace(key1, key2);
    } else {
        WSH.Echo('第' + n + '行 多处\n' + key1);
    }
    n += 2;
}
fso.OpenTextFile('Result.Log', 2, true).Write(str);
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WHY

@if(0)==(0) echo off
cscript //nologo //e:jscript "%~f0" <  替换.txt
pause & goto :EOF
@end

var n = 1;
var fso = new ActiveXObject('Scripting.FileSystemObject');
var str = fso.OpenTextFile('work.txt', 1).ReadAll();

while(!WSH.StdIn.AtEndOfStream){
    var key1 = WSH.StdIn.ReadLine(), key2 = WSH.StdIn.ReadLine();
    var arr  = str.split(key1);
    var Len  = arr.length;
    if (Len < 2) {
        WSH.Echo('第' + n + '行 无\n' + key1);
    } else {
        str = arr.join(key2);
    }
    n += 2;
}
fso.OpenTextFile('Result.Log', 2, true).Write(str);
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