Javascript搜索数组中的部分字符串

问题描述

具有一个返回对象数组的函数.该数组具有一个rate对象，该对象具有一个名称字段.名称字段内是诸如慢速"和最快"的名称.

Have a function that returns an array of objects. The array has a rate object that has a name field. Inside the name field are names such as "Slow speed" and "Fast speed".

我写了以下文章，希望创建一个新的数组，该数组将过滤出数组值，只返回那些与rate [i] .name相匹配的慢"值.

I have written the following in hopes to create a new array that will filter out the array values and just return only those with "Slow" that matches from the rates[i].name.

到目前为止，我在开发人员控制台中遇到此错误.未捕获的TypeError:value.substring不是函数"

So far I am encountering this error in my dev console."Uncaught TypeError: value.substring is not a function"

var rates = myArray();
var index, value, result;
var newArr = [];

for (index = 0; index < rates.length; ++index) {
    //value = rates[index];
    if (value.substring(0, 5) === "Stand") {
        result = value;
        newArr.push();
        break;
    }
}

在控制台中返回数组的一部分.

Part of array return in console.

"rates":[{"id":1123,"price":"1.99","name":"Slow speed - Red Car","policy":{"durqty":1,"durtype":"D","spdup":15000,"spddwn":15000}

推荐答案

您在每个数组位置都有一个对象，而不是字符串本身，请尝试以下操作:

You have an object at each array location not the string itself, try this instead:

var rates = myArray();
var index, value, result;
var newArr = [];

for (index = 0; index < rates.length; ++index) {
    name = rates[index].name;
    if (name.substring(0, 4) === "Slow") {
        newArr.push(rates[index]);
    }
}

尝试使用 filter 这样的函数，查看起来更加干净

Try using filter function like this, it is much more cleaner to see

var newArr = rates.filter(function(rate){
  return rate.name && rate.name.substring(0,4) === "Slow";
});

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