出现后,JS输出到div标签会立即消失

时间:2017-03-20 10:10:23

标签: javascript html html5 calculator

我正在制作一个基本计算器,我希望用户计算的每个结果都显示在div历史记录中。问题是,无论何时进行计算,结果都会在历史记录下显示几分之一秒,然后消失。我正在使用的功能如下:

function sum() {
        getNumbers();
        var sum = input1 + input2;
        alert(sum);
        document.getElementById("History").innerHTML += sum;
}

如果需要我的完整html / js代码:

   var input1, input2

function getNumbers() {
input1 = Number(document.getElementById("imp1").value);
input2 = Number(document.getElementById("imp2").value);
}

function sum() {
	getNumbers();
	var sum = input1 + input2;
	alert(sum);
	document.getElementById("History").innerHTML += "<br>" + sum;
}

function diff() {
	getNumbers();
	var diff = input1 - input2;
	 alert(diff);
	 document.getElementById("History").innerHTML += "<br>" +  diff;
}

function prod() {
	getNumbers();
	var prod = input1 * input2;
	alert(prod);
	document.getElementById("History").innerHTML += "<br>" +  prod;
}

function quot() {
	getNumbers();
	var quot = input1 / input2;
	alert(quot);
	document.getElementById("History").innerHTML += "<br>" +  quot;
}
 

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <title>Calculator</title>
    <link rel ="stylesheet" href="calculator.css" />
    <script src ="calculator.js"></script>
    
    
    <div id="calc">
    	<form name="calc_input">
    	<input type="text" id="imp1" />
    	<input type="text" id="imp2" />
    	<!-- buttons -->
    	<button onclick="sum()" id="add" value="sum">Add</button>
    	<button onclick="diff()" id="subtract" value="diff">Subtract</button>
    	<button onclick="prod()" id="multiply" value="prod">Multiply</button>
    	<button onclick="quot()" id="divide" value="quot">Divide</button>
    
    	</form>
    </div>
    
    <div id="History">
    <p>
    History:
    
    </p>
    </div>
    </head>
    </html>
 

1 个答案:

答案 0 :(得分:0)

默认情况下,它可能与具有提交行为的按钮有关。当您点击它时,可能是提交表单并重新加载页面。尝试为每个按钮添加type="button"