$freight = [];

这是一行 PHP 代码，它创建了一个名为 $freight 的空数组。在 PHP 中，数组是一种用来存储多个值的数据结构，可以通过索引或关联键来访问数组中的元素。在这里，$freight 数组没有任何元素，因为它是空的。你可以通过向数组添加元素来填充它，例如：

$freight = ["box", "parcel", "envelope"];

这将创建一个包含三个元素的数组，分别为 "box"、"parcel" 和 "envelope"。

相关问题

$('#freight_Declar').numberbox('setValue',$('#freight_Declar').val() == null||$('#freight_Declar').val() ==""?0:$('#freight_Declar').val(),null);触发change事件

在 EasyUI 的 `numberbox` 组件中，如果需要在设置值后触发 `change` 事件，可以使用 `triggerHandler` 方法来手动触发事件。以下是一个示例代码：

// 获取 numberbox 元素
var numberbox = $('#freight_Declar');

// 设置值
numberbox.numberbox('setValue', ($('#freight_Declar').val() == null || $('#freight_Declar').val() == "") ? 0 : $('#freight_Declar').val());

// 触发 change 事件
numberbox.triggerHandler('change');

在上面的示例代码中，我们首先获取到 `numberbox` 元素，并使用 `numberbox.numberbox('setValue', value)` 方法来设置值，其中的 `value` 是根据你的条件设置的值。

然后，我们使用 `triggerHandler('change')` 方法来手动触发 `change` 事件。

请注意，使用 `triggerHandler` 方法只会触发事件的回调函数，而不会实际触发浏览器中的事件。如果需要同时触发浏览器中的事件，请使用 `trigger` 方法。

根据实际需求，你可以根据新值和旧值进行相应的逻辑处理。

把以下sqlite的插入语句，转换成有效的mysql语句 String add_sql = "INSERT INTO detail(" "name," "width," "height," "quantity," "material," "thickness," "stiffiness," "density," "materialUnitPrice," "materialSize,pcs," "columnNum," "rowNum," "machineUnitPrice," "sampleCost," "shearPlate," "levelling," "freight," "others," "costUnitPrice," "quotePrice," "shearPlateAmount," "standbyPlate," "actualWeight," "sales," "estimateCost," "futureProfit," "createtime) " "VALUES('$v_name'," "'$v_width'," "'$v_height'," "'$v_quantity'," "'$v_material'," "'$v_thickness'," "'$v_stiffiness'," "'$v_density'," "'$v_materialUnitPrice'," "'$v_materialSize'," "'$v_pcs'," "'$v_columnNum'," "'$v_rowNum'," "'$v_machineUnitPrice'," "'$v_sampleCost'," "'$v_shearPlate'," "'$v_levelling'," "'$v_freight'," "'$v_others'," "'$v_costUnitPrice'," "'$v_quotePrice'," "'$v_shearPlateAmount'," "'$v_standbyPlate'," "'$v_actualWeight'," "'$v_sales'," "'$v_estimateCost'," "'$v_futureProfit'," "'$v_createtime')";

以下是将您提供的SQLite插入语句转换为有效的MySQL语句的方法：

String add_sql = "INSERT INTO detail("
  "name,"
  "width,"
  "height,"
  "quantity,"
  "material,"
  "thickness,"
  "stiffiness,"
  "density,"
  "materialUnitPrice,"
  "materialSize_pcs,"
  "columnNum,"
  "rowNum,"
  "machineUnitPrice,"
  "sampleCost,"
  "shearPlate,"
  "levelling,"
  "freight,"
  "others,"
  "costUnitPrice,"
  "quotePrice,"
  "shearPlateAmount,"
  "standbyPlate,"
  "actualWeight,"
  "sales,"
  "estimateCost,"
  "futureProfit,"
  "createtime) "
  "VALUES('$v_name',"
  "'$v_width',"
  "'$v_height',"
  "'$v_quantity',"
  "'$v_material',"
  "'$v_thickness',"
  "'$v_stiffiness',"
  "'$v_density',"
  "'$v_materialUnitPrice',"
  "'$v_materialSize,$v_pcs',"
  "'$v_columnNum',"
  "'$v_rowNum',"
  "'$v_machineUnitPrice',"
  "'$v_sampleCost',"
  "'$v_shearPlate',"
  "'$v_levelling',"
  "'$v_freight',"
  "'$v_others',"
  "'$v_costUnitPrice',"
  "'$v_quotePrice',"
  "'$v_shearPlateAmount',"
  "'$v_standbyPlate',"
  "'$v_actualWeight',"
  "'$v_sales',"
  "'$v_estimateCost',"
  "'$v_futureProfit',"
  "'$v_createtime')";

// 以下是将单引号转义处理
add_sql = add_sql.replaceAll("'", "\\'");

// 将 $v_materialSize,$v_pcs 拆分成两个变量 $v_materialSize 和 $v_pcs
String[] materialSizeAndPcs = v_materialSize_pcs.split(",");
String v_materialSize = materialSizeAndPcs[0];
String v_pcs = materialSizeAndPcs[1];

// 最终生成的MySQL语句
String mysql_sql = add_sql.replaceFirst("detail", "detail_mysql");

请注意，上述代码仅是将SQLite插入语句转换为MySQL语句的一种方法。在实际应用程序中，您需要根据需要进行适当的更改，例如处理数据类型差异和处理插入错误等。