我遇到問題。我正在學習JavaScript,但我不知道如何創建僅用於JavaScript文件的表格。我必須爲每個字母頻率輸出創建一個表格,但我不知道如何去做。下面是輸出我應該有:使用Javascript創建表格
在我心裏的HTML工作的開始,但我不能因爲這部分是測試我的代碼必須經過相關。在這裏,我將展示其中的一些:
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但寫入將回調測試者的功能只是代碼。下面是我做的,但我不知道這是否是正確的,以及如何前進:
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");
}
}
}
這個代碼與一個功能,我寫這之前算在命令行的用戶的頻率信:
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;
}
希望問題清楚,你可以幫助我和那些需要它的人。我環顧網絡,他們談論一些頻率表來定義我的問題。我不知道,如果T的右
退房MDN爲[*表API *] (https://developer.mozilla.org/en/docs/Web/API/HTMLTableElement),它也列在[* HTML 5表格元素規範*](http://www.w3.org/html/wg /drafts/html/master/tabular-data.html#the-table-element)。 – RobG 2014-09-26 22:06:15