try to take over the world!
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// ==UserScript==
// @name New Userscript
// @namespace http://tampermonkey.net/
// @version 0.1
// @description try to take over the world!
// @author You
// @match http://electronics-course.com/boolean-algebra
// @grant none
// ==/UserScript==
(function() {
'use strict';
var button = document.createElement("button");
button.innerHTML = "GO";
button.type = "button";
var body = document.getElementsByClassName("form-group")[1];
body.appendChild(button);
let input = document.getElementById("expr");
let text = document.getElementById("expr").value;
input.addEventListener('change', updateValue);
function updateValue(e) {
text = e.target.value;
}
button.addEventListener ("click", function() {
changejs(text);
});
function changejs(text){
let number = text;
let numbermul = [] ;
console.log(number);
let Step0 = '' ;
let Cnumber = [];
let CnumberStep1 = '' ;
let brackets= 0;
if(number.indexOf('-') >-1){
alert('輸入格式錯誤');
return;
}
if(number.indexOf('*') >-1){
if(confirm("請不要輸入'*'，是否要進行自動去除'*' 號")){
numbermul = number.split("*");
number =numbermul.join('');
}
}
for (let i = 0; i < number.length; i++) {
if(number[i] == '('){
brackets = Cnumber.length;
document.getElementById("expr").value = brackets;
}
if(number[i] == "'"){
if(number[i-1] == ')'){
Cnumber.splice(brackets, 0,'~')
}else{
Cnumber.pop();
Cnumber.push('~');
Cnumber.push(number[i-1]);
}
if(number[i+1] == '(' || number[i+1] !== '+'){
if(i !== number.length - 1){
Cnumber.push('*');
}
}
}else if(number[i] == ')' && number[i+1] == '('){
Cnumber.push(number[i]);
Cnumber.push('*');
}else if(number[i] == ')' && number[i+1] == "'" && number[i+2] == '('){
Cnumber.push(number[i]);
Cnumber.push('*');
}else if(number[i] !== '+' && number[i+1] !== '+'){
if(number[i+1] !== "'" && number[i] !== '(' && number[i+1] !== ')'){
Cnumber.push(number[i]);
if(i !== number.length - 1){
Cnumber.push('*');
}
}else{
Cnumber.push(number[i]);
}
}else{
Cnumber.push(number[i]);
}
}
CnumberStep1 = Cnumber.join('');
document.getElementById("expr").value = CnumberStep1;
}
})();