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                            有時候您需要修改一個存在的字段，例如：您可能想增加保存文本字段的長度。通過 change 方法讓這件事情變得非常容易！假設我們想要將字段 name 的長度從 25 增加到 50 的時候：

~~~
Schema::table('users', function($table)
{
    $table->string('name', 50)->change();
});
~~~

另外也能將某個字段修改為允許 NULL：

~~~
Schema::table('users', function($table)
{
    $table->string('name', 50)->nullable()->change();
});
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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