5.every&some (1)
2018-06-02 本文已影响0人
Night_LION
/** 场景1
* 计算对象数组中每个电脑操作系统是否可用
* 大于16位操作系统表示可用,否则不可用
*/
var computers = [
{name:"Apple",ram:16},
{name:"IBM",ram:4},
{name:"Acer",ram:32}
];
var everyComputersCanRunProgram = true;
var someComputersCanRunProgram = false;
for(var i = 0; i < computers.length; i++){
var computer = computers[i];
if(computer.ram < 16){
everyComputersCanRunProgram = false;
}else{
someComputersCanRunProgram = true;
}
}
console.log(everyComputersCanRunProgram);
console.log(someComputersCanRunProgram);
/**
* Every: 一真即真
* Some: 一假即假
*/
var every = computers.every(function(computer){
return computer.ram > 16;
})
console.log("==========");
console.log(every);
var some = computers.some(function(computer){
return computer.ram > 16;
})
console.log(some);
/** 场景2
* 假定有一个注册页面,判断所有input内容的长度是否大于0
*
*/