Question

内部javascript

<?php
  echo 'var packages_disc = '.json_encode($packages).';';
?>
alert(JSON.stringify(packages_disc));

这是警报输出

[
  {"id":"3","package_name":"Standard","invoice_amount":"30000"},
  {"id":"4","package_name":"Premium","invoice_amount":"50000"},
  {"id":"5","package_name":"Luxury","invoice_amount":"120000"}
]

我想获得单个元素并分配给变量

Answer 1

迭代数组并找到符合条件的对象......

function getPackageByName(name) {
    return packages_disc.find(p => p.package_name == name);
}

var packages_disc = [
    {"id":"3","package_name":"Standard","invoice_amount":"30000"},
    {"id":"4","package_name":"Premium","invoice_amount":"50000"},
    {"id":"5","package_name":"Luxury","invoice_amount":"120000"}
];

var premiumPackage = getPackageByName("Premium");

alert(premiumPackage.invoice_amount);

Answer 2

如果您想要基于invoice_amount的{{1}}，请执行以下操作：

＆＃13;

package_name

＆＃13;

Answer 3

尝试以下方式：

function getInvoiceAmount(thatObj){
  var arr = [{"id":"3","package_name":"Standard","invoice_amount":"30000"},{"id":"4","package_name":"Premium","invoice_amount":"50000"},{"id":"5","package_name":"Luxury","invoice_amount":"120000"}];
  var package = thatObj.options[thatObj.selectedIndex].text
  var res = arr.filter(function(item, i){
    return item.package_name == package

  });

  console.log(res[0].invoice_amount + ' for package ' +package)
}

<select id="package" onchange="getInvoiceAmount(this)">
  <option>Select Package</option>
  <option>Standard</option>
  <option>Premium</option>
  <option>Luxury</option>
</select>

如何将json对象转换为单个javascript变量

3 个答案: