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                            `<a href="#">【內容】</a> ` :點擊【內容】后會回到網面頂部
`<a href="javascript:void(0)">【內容】</a>`:點擊【內容】后不會回到網頁頂部

`"#"`包含了一個位置信息
默認的錨點是＃top 也就是網頁的上端
而`"javascript:void(0)"`僅僅表示一個死鏈接
這就是為什么有的時候頁面很長瀏覽鏈接明明是＃可是跳動到了頁首
而`"javascript:void(0)"`則不是如此
所以調用腳本的時候最好用`void(0)`

判斷數組是否為空：
~~~
var arr = [];
if(Array.isArray(arr) && arr.length === 0){
    console.log('是空數組');
}
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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