Javascript typing game implementation code

Effect:

Below is the core code
Copy codeThe Code is as follows:
GAME = {
// Randomly generate letters
RandLetter: function (){
Var arrLetter = new Array ("A", "B", "C", "D", "E", "F", "G", "H ", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R ", "S", "T", "U", "V", "W ",
"X ",
"Y", "Z ");
// Randomly generate letters
Var index = Math. floor (Math. random () * 26 );
Return arrLetter [index];
},
// Random letter color
RandLetterColor: function (){
Var arrLetterColor = new Array ("Red", "Green", "#555", "Blue", "Black ");
Var index = Math. floor (Math. random () * 4 );
Return arrLetterColor [index];
},
// Random letter size
RandLetterSize: function (){
Var arrLetterSize = new Array ("12px", "16px", "20px", "24px", "28px", "32px", "36px", "40px ");
Var index = Math. floor (Math. random () * 7 );
Return arrLetterSize [index];
},
// Create a DIV
DivCreate: function (width, height, left, top, value ){
This. width = width;
This. height = height;
This. div = document. createElement ("div ");
This. div. style. width = width;
This. div. style. height = height;
This. div. style. left = left;
This. div. style. top = top;
This. div. innerText = value;
This. div. style. color = this. randLetterColor ();
This. div. style. fontSize = this. randLetterSize ();
This. div. style. lineHeight = this. div. style. height;
This. div. style. textAlign = "center ";
This. div. style. fontWeight = "bold ";
// This. div. style. border = "solid red 1px ";
This. div. style. position = "relative ";
Document. getElementById ("map"). appendChild (this. div );
Return this. div;
},
// DIV whereabouts
DivDown: function (){
Var divTop = parseInt (this. div. style. top. slice (0,-2); // Top of the letter box
Var mapHeight = parseInt (document. getElementById ("map"). style. height. slice (0,-2 ));
// Disappear
If (divTop <mapHeight-parseInt (this. height) + 20 ){
This. div. style. top = divTop + 30;
// Obtain the key value
Document. onkeydown = function (){
// Whether the key letter is equal to the div Value
If (String. fromCharCode (event. keyCode) = GAME. div. innerText ){
Document. getElementById ("TextRecord"). value = "correct ";
GAME. div. style. display = "none ";
ClearInterval (GAME. timeCreateID );
GAME. divCreate (100,100, Math. floor (Math. random () * 300),-30, GAME. randLetter ());
}
Else {
Document. getElementById ("TextRecord"). value = "error ";
}
}
}
// Disappear when the bottom line is reached, and then create a DIV
Else {
This. div. style. display = "none ";
GAME. divCreate (100,100, Math. floor (Math. random () * 300),-30, this. randLetter ());
}
},
TimeCreateID: null,
TimeDownID: null,
START: function (){
This. divCreate (100,100,200,-40, this. randLetter ());
This. timeDownID = setInterval ("GAME. divDown ();", 1000 );
Document. getElementById ('buttonstart'). disabled = 'Disabled ';
Document. getElementById ('buttonstop'). disabled = '';
},
STOP: function (){
If (this. timeDownID! = Null ){
ClearInterval (this. timeDownID );
This. div. style. display = "none ";
}
Document. getElementById ('buttonstart'). disabled = '';
Document. getElementById ('buttonstop'). disabled = 'Disabled ';
}

}

Effect demonstration
Snmon becomes a positive question--|, the question requirement must be 100 times more complex... <P> currently, only random letters are generated, and the keyboard is listened to. The score is not calculated yet. </P> score: <input id = "TextRecord" value = "0" type = "text"/> <input id = "ButtonStart" onclick = "GAME. START (); "value =" game start "type =" button "> <input id =" ButtonStop "onclick =" GAME. STOP (); "value =" game stop "type =" button ">
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]