Question

我如何计算jQuery中的每个函数？

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
}

目前代码在每个循环中返回<script> ajax(); function ajax(){ $.ajax({ url:"ChinaWeather.json", dataType:"json", success: function(data){ $.each(data, function(index, item){ var sum = 1; $('#countryweatherwrap').append('<div id="countryweather' + sum + '">' + data[index].season + 'Temperatuur: ' + data[index].temperature+' °C <br />' + '<div style="height:'+ data[index].temperature*5.50 +'px;width:100%;border:1px solid #000; background-color:yellow"></div></div>' ); }); } }) } </script>。我希望它能够计算，以便返回<div id="countryweather">，<div id="countryweather2">等。

Answer 1

一个。将var sum移到每个循环之外（使其成为全局）
湾通过sum

将++;的值增加1

<script>        
    ajax();
    function ajax(){        
        $.ajax({
            url:"ChinaWeather.json",
            dataType:"json",
            success: function(data){
                var sum = 1;
                $.each(data, function(index, item){                    
                    $('#countryweatherwrap').append('<div id="countryweather' + sum + '">' + data[index].season + 'Temperatuur: ' +
                        data[index].temperature+' °C <br />' + '<div style="height:'+ data[index].temperature*5.50  +'px;width:100%;border:1px solid #000; background-color:yellow"></div></div>'                      
                        );  
                      sum++;
                    });
            }
        })
    }   
</script>

Answer 2

您可以使用索引：

$.each(data, function(index, item) {
    $('#countryweatherwrap').append('<div id="countryweather' + (index+1) + '">' + data[index].season + 'Temperatuur: ' + data[index].temperature + ' °C <br />' + '<div style="height:' + data[index].temperature * 5.50 + 'px;width:100%;border:1px solid #000; background-color:yellow"></div></div>');
});

其索引从0开始，因此请添加1。

在jQuery中计算一个计数总和

2 个答案: