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举例讲解JavaScript中将数组元素转换为字符串的方法

时间:2021-07-01 10:21:17 帮助过:4人阅读

首先来看一下从一个数组中选择元素的方法slice():
源代码:

<!DOCTYPE html>
<html>
<body>
​
<p id="demo">Click the button to extract the second and the third elements from the array.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
var citrus = fruits.slice(1,3);
var x=document.getElementById("demo");
x.innerHTML=citrus;
}
</script>
​
</body>
</html>   

测试结果:

Orange,Lemon

我们可以用数组的元素组成字符串,相关的join()方法使用例子:

源代码:

<!DOCTYPE html>
<html>
<body>
​
<p id="demo">Click the button to join the array elements into a string.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var x=document.getElementById("demo");
x.innerHTML=fruits.join();
}
</script>
​
</body>
</html> 

测试结果:

Banana,Orange,Apple,Mango

直接转换数组到字符串则可以用toString()方法:
源代码:

<!DOCTYPE html>
<html>
<body>
​
<p id="demo">点击按钮将数组转为字符串并返回。</p>
​
<button onclick="myFunction()">点我</button>
​
<script>
function myFunction()
{
 var fruits = ["Banana", "Orange", "Apple", "Mango"];
 var str = fruits.toString();
 var x=document.getElementById("demo");
 x.innerHTML= str;
}
</script>
​
</body>
</html>

测试结果:

Banana,Orange,Apple,Mango 

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