JavaScript,数组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
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
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
JavaScript,数组
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