JavaScript 中循环的最后一次迭代
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Last iteration of a loop in JavaScript
提问by Chathula
I want to do something like this:
我想做这样的事情：
for (var i=1; i<=10; i++) {
document.write(i + ",");
}
It shows a result like:
它显示如下结果：
1,2,3,4,5,6,7,8,9,10,
But I want to remove the last ",", and the result should be like this:
但是我想去掉最后一个“,”，结果应该是这样的：
1,2,3,4,5,6,7,8,9,10
采纳答案by Peter Rasmussen
回答by u283863
You should use .joininstead:
你应该使用.join：
var txt = []; //create an empty array
for (var i = 1; i <= 10; i++) {
txt.push(i); //push values into array
}
console.log(txt.join(",")); //join all the value with ","
回答by Denys Séguret
You might simply test when generating :
您可以在生成时简单地进行测试：
for (var i=1; i<=10; i++) {
document.write(i);
if (i<9) document.write(',');
}
Note that when you start from an array, which might be your real question behind the one you ask, there is the convenient joinfunction :
请注意，当您从数组开始时，这可能是您提出的真正问题，有一个方便的join功能：
var arr = [1, 2, 3];
document.write(arr.join(',')); // writes "1,2,3"
回答by Prateek Shukla
Try This-
试试这个-
str="";
for (var i=1; i<=10; i++) {
str=str+i + ",";
}
str.substr(0,str.length-1);
document.write(str);
回答by Dieepak
Try it.
试试看。
var arr = new Array();
for (i=1; i<=10; i++) {
arr.push(i);
}
var output = arr.join(',');
document.write(output);
回答by Daniel Chen
for (var i=1; i<=10; i++) {
if (i == 10) {
document.write(i);
}
else {
document.write(i + ",");
}
}
