//创建数组
var arr=new Array();
arr=['*','##',"***","&&","****","##*"];
arr[7]="**";
//显示数组长度
alert("数组的长度是 :"+arr.length);
//将数组内容输出,完成达到的效果。
document.write(arr[0]+"<br>");
document.write(arr[7]+"<br>");
document.write(arr[2]+"<br>");
document.write(arr[4]+"<br>");
var arr=new Array();
arr=['*','##',"***","&&","****","##*"];
arr[7]="**";
//显示数组长度
alert("数组的长度是 :"+arr.length);
//将数组内容输出,完成达到的效果。
document.write(arr[0]+"<br>");
document.write(arr[7]+"<br>");
document.write(arr[2]+"<br>");
document.write(arr[4]+"<br>");
我觉的可以这么写
var a = document.getElementById('txt1').value;
var b = document.getElementById('txt2').value;
var f = document.getElementById('select').value;
document.getElementById('fruit').value = eval(a + f + b);
var a = document.getElementById('txt1').value;
var b = document.getElementById('txt2').value;
var f = document.getElementById('select').value;
document.getElementById('fruit').value = eval(a + f + b);
Nili
var infos = [['小A','女',21,'大一'],['小B','男',23,'大三'],['小C','男',24,'大四'],['小D','女',21,'大一'],['小pppp','男',21,'大一'],['小9999','女',21,'大一'],['ioooo','女',21,'大一']]
for(let i=0;i<infos.length;i++){
if(infos[i].includes('大一')&&infos[i].includes('女')){
console.log(infos[i][0])
}
}
var infos = [['小A','女',21,'大一'],['小B','男',23,'大三'],['小C','男',24,'大四'],['小D','女',21,'大一'],['小pppp','男',21,'大一'],['小9999','女',21,'大一'],['ioooo','女',21,'大一']]
for(let i=0;i<infos.length;i++){
if(infos[i].includes('大一')&&infos[i].includes('女')){
console.log(infos[i][0])
}
}
2021-09-02