Can you tell me why this alert does not work?

my js codes:

var character =
document.getElementById("character");
var block = document.getElementById("block");




function jump() {
if (character.classList != "animate") {
    character.classList.add("animate");
}

setTimeout(function () {
    character.classList.remove("animate");
}, 500);

var checkDead = setlnterval(function () {
    var characterTop =
        parseInt(window.getComputedStyle(character)
            .getPropertyValue("top"));

    var blockLeft =
        parseInt(window.getComputedStyle(block)
            .getPropertyValue("left"));
   

here is the if part (my problem): i want to know why it dose not work?

        if (blockLeft<20 && blockLeft>0 && characterTop>=130) {
        block.style.animation = "none";
        block.style.display = "none";
        alert("U Lose!");
    }
}, 10);

}