我遇到问题。我正在学习JavaScript,但我不知道如何创建仅用于JavaScript文件的表格。我必须为每个字母频率输出创建一个表格,但我不知道如何去做。下面是输出我应该有:使用Javascript创建表格
在我心里的HTML工作的开始,但我不能因为这部分是测试我的代码必须经过相关。在这里,我将展示其中的一些:
display_letter_frequency(letter_frequency("Hello"),document.getElementById("frequency_table"));
var rows = document.getElementById("frequency_table").querySelectorAll('tr')
equal(rows.length, 4, "With input String 'Hello' there should be 4 table rows")
equal(rows[0].querySelectorAll('td')[0].innerHTML, 'H', "1st td of 1st tr should have the value H");
equal(rows[0].querySelectorAll('td')[1].innerHTML, '1', "2nd td of 1st tr should have the value 1");
equal(rows[1].querySelectorAll('td')[0].innerHTML, 'E', "1st td of 2nd tr should have the value E");
equal(rows[1].querySelectorAll('td')[1].innerHTML, '1', "2nd td of 2nd tr should have the value 1");
equal(rows[2].querySelectorAll('td')[0].innerHTML, 'L', "1st td of 3rd tr should have the value L");
equal(rows[2].querySelectorAll('td')[1].innerHTML, '2', "2nd td of 3rd tr should have the value 2");
equal(rows[3].querySelectorAll('td')[0].innerHTML, 'O', "1st td of 4th tr should have the value O");
equal(rows[3].querySelectorAll('td')[1].innerHTML, '1', "2nd td of 4th tr should have the value 1");
我也不能使用的console.log但写入将回调测试者的功能只是代码。下面是我做的,但我不知道这是否是正确的,以及如何前进:
function display_letter_frequency(a,dom) {
if(a === undefined){
return undefined
} else {
var tbl = document.createElement("table");
var tblBody = document.createElement("tbody");
for(var x in a){
var row = document.createElement("tr");
}
}
}
这个代码与一个功能,我写这之前算在命令行的用户的频率信:
function letter_frequency(s) {
if(s === undefined){
return undefined
} else {
var freq = {};
for (var i = 0; i < s.length; i++) {
var character = s.charAt(i).toUpperCase();
if (freq[character]) {
freq[character]++;
} else {
freq[character] = 1;
}
}
}
return freq;
}
希望问题清楚,你可以帮助我和那些需要它的人。我环顾网络,他们谈论一些频率表来定义我的问题。我不知道,如果T的右
退房MDN为[*表API *] (https://developer.mozilla.org/en/docs/Web/API/HTMLTableElement),它也列在[* HTML 5表格元素规范*](http://www.w3.org/html/wg /drafts/html/master/tabular-data.html#the-table-element)。 – RobG 2014-09-26 22:06:15