Question

＆＃13;

function checkPrice(afford){
	var z = document.getElementById('man_cost').innerHTML;
	var a = document.getElementById('mouse_cost').innerHTML;
	var b = document.getElementById('farm_cost').innerHTML;
	var c = document.getElementById('factory_cost').innerHTML;
	a = parseInt(a);
	b = parseInt(b);
	c = parseInt(c);
	z = parseInt(z);
	if(afford == 'cannot'){
		if(amount < z){
			document.getElementById('upClick').style.opacity = '.5';
		};
		if(amount < a){
			document.getElementById('upMouse').style.opacity = '.5';
		};
		if(amount < b){
			document.getElementById('upFarm').style.opacity = '.5';
		};
		if(amount < c){
			document.getElementById('upFactory').style.opacity = '.5';
		};
	}else if(afford == 'can'){
		if(amount >= z){
			document.getElementById('upClick').style.opacity = '1';
		};
		if(amount >= a){
			document.getElementById('upMouse').style.opacity = '1';
		};
		if(amount >= b){
			document.getElementById('upFarm').style.opacity = '1';
		};
		if(amount >= c){
			document.getElementById('upFactory').style.opacity = '1';
		};
	};
	return;
};

setInterval(checkPrice('can'),1000);

＆＃13;

setInterval似乎无法运作。价格每秒更新一次，但如果价格达到可承受的金额，checkPrice函数不会执行该函数，并且效果不会发生。但是，当我在用户交互后调用setPrice时，它可以正常工作。

Answer 1

您需要将其写为：

setInterval(function(){checkPrice('can')},1000);

这是因为第一个参数需要function，functionName(..)将给出返回值而不是函数本身。注意如果函数没有参数，则可以写成：setInterval(checkPrice,1000);。

Answer 2

您的var 金额在所有if()尚未定义，这可能是它无效的原因。

Answer 3

如果您想在执行中“动态”传递值，请尝试使用bind()方法。

function checkPrice(){
    var afford = this.option;

    var z = document.getElementById('man_cost').innerHTML;
    var a = document.getElementById('mouse_cost').innerHTML;
    var b = document.getElementById('farm_cost').innerHTML;
    var c = document.getElementById('factory_cost').innerHTML;
    a = parseInt(a);
    b = parseInt(b);
    c = parseInt(c);
    z = parseInt(z);
    if(afford == 'cannot'){
        if(amount < z){
            document.getElementById('upClick').style.opacity = '.5';
        };
        if(amount < a){
            document.getElementById('upMouse').style.opacity = '.5';
        };
        if(amount < b){
            document.getElementById('upFarm').style.opacity = '.5';
        };
        if(amount < c){
            document.getElementById('upFactory').style.opacity = '.5';
        };
    }else if(afford == 'can'){
        if(amount >= z){
            document.getElementById('upClick').style.opacity = '1';
        };
        if(amount >= a){
            document.getElementById('upMouse').style.opacity = '1';
        };
        if(amount >= b){
            document.getElementById('upFarm').style.opacity = '1';
        };
        if(amount >= c){
            document.getElementById('upFactory').style.opacity = '1';
        };
    };
    return;
};

setInterval(checkPrice.bind({option: 'afford'}),1000);

setInterval不起作用

3 个答案: