Résumé des opérations de base de jscss

<button onclick="goBack()">返回上一页</button>
<script>
function goBack(){
window.history.go(-1)     -2即为退后2页
}
</script>

document.body.scrollTop = 0
document.documentElement.scrollTop = 0

<style>
div{
width:100%;
overflow: hidden;
white-space:nowrap;
text-overflow:ellipsis;
}
</style>

div{font-family:”\5FAE\8F6F\96C5\9ED1”}

div{font-family:”Microsoft YaHei”}

this.newarr = Array.from(new Set(this.arr))

var anObj = { 100: 'a', 2: 'b', 7: 'c' };
console.log(Object.keys(anObj));   // console: ['2', '7', '100']