js动态添加数组可以按下面的步骤:
1、在数组的开头添加新元素 - unshift()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.unshift("Lemon","Pineapple")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
<p><b>Note:</b>The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be <em>undefined</em>.</p>
</body>
</html>
测试结果:
Lemon,Pineapple,Banana,Orange,Apple,Mango
2、在数组的第2位置添加一个元素 - splice()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.splice(2,0,"Lemon","Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
测试结果:
Banana,Orange,Lemon,Kiwi,Apple,Mango
3、数组的末尾添加新的元素 - push()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add a new element to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"]
function myFunction()
{
fruits.push("Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
测试结果:
Banana,Orange,Apple,Mango,Kiwi
1.不可以直接使用。
2.不能使用变量作为变量名，据我了解没有哪一种语言可以这么干。
3.你可以使用二维数组来赋值
var array=new Array()
for(var i=0i<3i++){
array[i]=[]
}
4.或者还有另一种方案用eval,它会把字符串当做表达式执行
eval("var test" + i + "=" + i)。
var arr=new Array()for (var ij = 0 ij <= 10 ij++) {
arr[ij] = new Array()
if (ij < 10) {
var idfz1, cs
cs = "0"
idfz1 = cs + ij
}
if (ij >= 10) {
idfz1 = ij
}
for (var j = 0 j <= 3 j++) {
if (j < 10) {
var idfz2, cs1
cs1 = "0"
idfz2 = cs1 + j
}
if (j >= 10) {
idfz2 = j
}
var id1 = idfz1 + idfz2
//alert("id1:" + id1)
arr[ij][j] = id1
}
}
alert(JSON.stringify(arr))
