Question

我不知道该脚本上的错误在哪里我的第一个错误是appenChild我认为我使用var head=document.getElementsByTagName.更正了...

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript</title>
<script type="text/javascript">
    function addHTML() {
        document.getElementById('testHTML').innerHTML = document.getElementById('txtHTML').value;
        document.getElementById('txtHTML').value=''}
    function resetHTML() {
        document.getElementById('testHTML').innerHTML = '';}
    function addJS () {
        var newScript= document.createElement('script');
        newScript.type='text/javascript';enter code here
        newScript.text= document.getElementById('txtjs').value;
        var head document.getElementsByTagName('head')[0].appenChild(newScript);

Answer 1

library(plotly) # version ‘4.7.1’ df <- read.csv('https://raw.githubusercontent.com/plotly/datasets/master/2014_us_cities.csv') df$q <- with(df, cut(pop, quantile(pop))) levels(df$q) <- paste(c("1st", "2nd", "3rd", "4th", "5th"), "Quantile") df$q <- as.ordered(df$q) g <- list( scope = 'usa', projection = list(type = 'albers usa'), showland = TRUE, landcolor = toRGB("gray85"), subunitwidth = 1, countrywidth = 1, subunitcolor = toRGB("white"), countrycolor = toRGB("white") ) p <- plot_geo(df, locationmode = 'USA-states', sizes = c(1, 250)) %>% layout(title = '2014 US city populations<br>(Click legend to toggle)', geo = g) %>% add_markers(x = ~lon, y = ~lat, size = ~pop, color = ~q, text = ~paste(df$name, "<br />", df$pop/1e6, " million") ) p据推测，Uncaught TypeError: Cannot read property 'value' of null at addJS正在返回document.getElementById('txtjs')。因此，您的HTML可能不包含null的元素。或许你错了它。或者你可能有一个脚本来动态生成它，但是这个脚本直到这个脚本之后才会运行，我不知道。

addInS未在HTMLInputElement.onclick中定义

1 个答案: