数组的Array.prototype.slice.call()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="app">
<p v-for="count in 10">第{{count}}次, 总计 10次</p>
<ul ref="ulParent">
<li style="height: 60px;">1</li>
<li style="height: 30px;">2</li>
<li style="height: 50px;">3</li>
<li style="height: 160px;">4</li>
<li style="height: 10px;">5</li>
</ul>
<button @click="getAllLiHeight()">获取高度数组</button>
<button @click="dealSome()">验证some</button>
</div>
<script src="lib/vue.js"></script>
<script>
new Vue({
el:'#app',
data: {
dataArr: ['123213', '123213.com', '哈哈哈哈']
},
methods: {
getAllLiHeight(){
let liHeightArr = [];
// 1. 获取dom元素
let allLis = this.$refs.ulParent.getElementsByTagName('li');
console.log(allLis[0].clientHeight);
console.log(Array.prototype.slice.call(allLis));
Array.prototype.slice.call(allLis).forEach(li => {
liHeightArr.push(li.clientHeight);
});
console.log(liHeightArr);
},
dealSome(){
let result = this.dataArr.some((str)=>{
return str === '哈哈哈哈';
});
console.log(result);
}
}
});
var obj1 = {0:'hello',1:'world'};
var obj2 = {0:'hello',1:'world',length:2};
var obj3 = [1,2];
var obj4 = "string";
console.log(Array.prototype.slice.call(obj4,1));//第二个参数相当于截取得起始下标
//Array.prototype.slice 调用Array类中的饿原型方法
//Array.prototype.slice.call(res)//使用call冒充一个据有length对象，转换成数组，绑定this指向——>对象.slice() 或者 字符.slice() 或者 数组.slice() ——>第二个参数为截取的起始下标
//作用：将传入具有length属性的参数转为数组
</script>
</body>
</html>
数组的fill方法
new Array(3).fill({}).map(()=>{return {name:'小明'}})
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