class EmptyArray {
constructor() {}
/* 1、arrayList = [];//该数组会被置空,引用的仍然存在 */
emptyArrayOriginal() {
let arrayList = ["a", "b", "c", "d", "e", "f", ""];
let arrayList2 = arrayList;
arrayList = [];
console.log("emptyArrayOriginal")
console.log(arrayList); //[]
console.log(arrayList2); // ["a", "b", "c", "d", "e", "f", ""]
}
/* 2、arrayList.length = 0 ;//包含引用该数组的也会被置空 */
emptyArrayByLength() {
let arrayList = ["a", "b", "c", "d", "e", "f", ""];
let arrayList3 = arrayList;
arrayList.length = 0;
console.log("emptyArrayByLength")
console.log(arrayList); //[]
console.log(arrayList3); //[]
}
/* 3、arrayList.splice(0,arrayList.length);//包含引用该数组的也会被置空 */
emptyArrayBySplice() {
let arrayList = ["a", "b", "c", "d", "e", "f", ""];
let arrayList4 = arrayList;
arrayList.splice(0, arrayList.length);
console.log("emptyArrayBySplice")
console.log(arrayList); //[]
console.log(arrayList4); //[]
}
/* 4、while(arrayList.length){ arrayList.pop() ;}//不推荐 */
emptyArrayByWhile() {
let arrayList = ["a", "b", "c", "d", "e", "f", ""];
let arrayList5 = arrayList;
while (arrayList.length) {
arrayList.pop();
}
console.log("emptyArrayByWhile")
console.log(arrayList); //[]
console.log(arrayList5);//[]
}
}
let ea = new EmptyArray();
ea.emptyArrayOriginal();
ea.emptyArrayByLength();
ea.emptyArrayBySplice();
ea.emptyArrayByWhile();
