function writeDocument(variable){
document.write(variable+"<br/>");
}
writeDocument("数组创建------------------------")
var arr = ["HTML","CSS","JavaScript","jQuery","Vue.js"];
writeDocument(arr);
writeDocument("数组下标取值------------------------")
writeDocument(arr[2]);
writeDocument("数组赋值------------------------")
arr[4]="React.Js";
writeDocument(arr[4]);
arr[5]="Vue.js";
writeDocument(arr);
arr[8]="Augular.Js";
writeDocument(arr);
writeDocument("获取数组长度------------------------")
var arr=["abc","cde","fij"];
writeDocument(arr);
writeDocument(arr.length);
writeDocument("截取数组某部分------------------------")
writeDocument(arr.slice(0,2));
writeDocument("往数组头添加元素------------------------")
writeDocument(arr.unshift("jkl","mno"));
writeDocument(arr);
writeDocument("往数组尾添加元素------------------------")
writeDocument(arr.push("xyz","cvb"));
writeDocument(arr);
writeDocument("删除数组第一个元素------------------------")
writeDocument(arr.shift());
writeDocument(arr);
writeDocument("删除数组最后一个元素------------------------")
writeDocument(arr.pop());
writeDocument(arr);
writeDocument("对字符串数组按升序排序------------------------")
writeDocument(arr.sort());
var numArr=[3,6,9,1,4,11];
writeDocument(numArr);
function compare(a,b){
if(a>b)
{
return 1;
}
if(a==b)
{
return 0;
}
if(a<b)
{
return -1;
}
}
numArr.sort(compare)
writeDocument("升序排序后:"+numArr);
function downcompare(a,b){
if(a>b)
{
return -1;
}
if(a==b)
{
return 0;
}
if(a<b)
{
return 1;
}
}
numArr.sort(downcompare)
writeDocument("降序排序后:"+numArr);
writeDocument("对数组反向排序------------------------")
writeDocument(numArr.reverse());
writeDocument("将数组元素连接成字符串------------------------")
writeDocument(numArr.join("-"));
writeDocument("数组与字符串的转换操作------------------------")
var str1 = "绿叶学习网";
var str2 = str1.split("").join("><");
var arr = str2.split("");
arr.unshift("<");
arr.push(">");
var result = arr.join("");
document.write(result+'<br/>');
writeDocument("------------------------")
function getarea(l,w,h)
{
var bottomarea=w*l;
var volumn=w*h*l;
var sizes=[bottomarea,volumn];
return sizes;
}
var str = getarea(5,10,7);
writeDocument("底部面积为:"+str[0]);
writeDocument("体积为:"+str[1]);
var arr=[1,2,3,4,5];
var sum=0;
for(var i=1;i<arr.length;i++){
sum+=arr[i];
}
writeDocument(sum);
console