javascript - Make gravity in HTML5 canvas work twice -


this jsfiddle: http://jsfiddle.net/au6br/13/

the problem when keep pressing keydown.up player jump multiple times. want define variable called jumpcount when player jump if jump variable greater value jumping stop.

  character.prototype.jump = function () { // jumping             character.maxjump += gravity;             character.y += character.maxjump;              if (keydown.up) {                 if (!character.jumping) {                     character.jumping = true;                     character.pos = 4;                     character.row = 2;                     character.h = 23;                     character.maxjump = -character.sp * 2.5;                 }             }             if (character.y >= ch - character.h) { // if character under bottom                 character.y = ch - character.h;                 character.jumping = false;             }          };

the first problem can jump when you're not on ground. it's because of onground function.

replace : 

return this.y <= ch - this.h;

with : 

return this.y >= ch - this.h;

you should use function in jump avoid duplicate code : 

if (character.onground()) { // if character under bottom     character.y = ch - character.h;     character.jumping = false; }

counting jumps (i assume want make double jumps) can't work long test if(keydown.up). when press key, value true more 1 frame (depending on duration player presses it), you'll never able correctly count number of jumps. must bind jump on onkeydown event, called once. after that, simple replace character.jumping integer.


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