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[英]As a page is redirected how can I use a javascript variable in the innerhtml of the page being loaded?
[英]can I update a javascript variable being displayed using innerhtml
我正在尝试使用JavaScript构建基本的预算计算器工具,该工具会在页面顶部显示运行总计,并在更改各个预算项目时进行更新。 为此,我使用[ document.getElementById("runningTotal").innerHTML += total_sp;
]。 这对于计算运行总计非常有用,但是每次我进行更改时,都会将新的总计附加到旧的总计中,因此屏幕上的输出没有任何意义。 谁能告诉我我该怎么做,以便每次进行更改时都会更新运行中的总数吗? 我是这一切的新手,非常感谢您可以提供的任何帮助。 干杯!
<script>
// defining pre-change spending levels
var research_sp = 217200
var wage_sp = 155000
var total_sp = wage_sp + research_sp
function changeresearchspending() {
var nameElement = document.getElementById("researchcalc");
//defining percentage change to research spending levels
var research_r = nameElement.value;
var research_ch = research_r * research_sp;
var research_sp_end = research_sp + research_ch;
total_sp = total_sp + research_ch
document.getElementById("researchChange").innerHTML += research_ch;
document.getElementById("endresearchTotal").innerHTML += research_sp_end;
document.getElementById("endTotalSpend1").innerHTML += total_sp;
document.getElementById("runningTotal").innerHTML += total_sp;
}
function changewagespending() {
var nameElement = document.getElementById("wagecalc");
//defining percentage change to wage spending levels
var wage_r = nameElement.value;
var wage_ch = wage_r * wage_sp;
var wage_sp_end = wage_sp + wage_ch;
total_sp = total_sp + wage_ch
document.getElementById("wageChange").innerHTML += wage_ch;
document.getElementById("endwageTotal").innerHTML += wage_sp_end;
document.getElementById("endTotalSpend2").innerHTML += total_sp;
document.getElementById("runningTotal").innerHTML += total_sp;
}
</script>
<div id="runningTotal">
SPENDING (RUNNING TOTAL) £
</div>
<br>
<div id="startresearchTotal">
Baseline research spending is: £
<script>document.write(research_sp)</script>
<br><br>
Baseline wage spending is: £
<script>document.write(wage_sp)</script>
<br><br>
Baseline total spending is: £
<script>document.write(total_sp)</script>
</div>
<br>
<input id="researchcalc" type="number">
<input type="button" value="change research spend" onClick="changeresearchspending()">
<div id="researchChange">
<br> Change in research spending is: £
</div>
<div id="endresearchTotal">
<br> New research spending is: £
</div>
<div id="endTotalSpend1">
<br> New total spending is: £
</div>
</div>
<br>
<input id="wagecalc" type="number">
<input type="button" value="change wage spend" onClick="changewagespending()">
<div id="wageChange">
<br> Change in wage spending is: £
</div>
<div id="endwageTotal">
<br> New wage spending is: £
</div>
<div id="endTotalSpend2">
<br> New total spending is: £
</div>
您可以将+ =替换为=,如下所示:
document.getElementById("runningTotal").innerHTML = total_sp;
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