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讲这个问题之前先普及一下JSON.parse()和JSON.stringify()方面的知识:
JSON.parse() 方法用于将一个 JSON 字符串转换为对象,如
var str = '{"name":"LeonWu","age":"18"}'
JSON.parse(str);
//结果为一个Object
// age: "18";
// name: "LeonWu";
JSON.stringify() 方法是将一个JavaScript值(对象或者数组)转换为一个 JSON字符串,如
var a = {a:1,b:2,c:"LeonWu"};
JSON.stringify(a);
//结果为 '{"a":1,"b":2,"c":"LeonWu"}'
最近在做项目,遇到了这个问题:
我是想把用户选择的东西传到另一个页面:
submit() {undefined
let cartlist = JSON.stringify(this.data.cart);
//这里我又定义了一个变量接收转换后的对象,就是因为这里为后面埋下了伏笔
console.log(cartlist);
wx.navigateTo({undefined
url: '../order/order?cartlist=' + cartlist,
})
}
另一个页面:
onLoad(options){undefined
console.log(JSON.parse(options)); //哈哈没那么容易,报错了在这里
},
其实在这里我传过来的值是这样的:
{cartlist: '{"count":1,"total":2,"list":{"1":1}}'} //类型还是对象
这虽然是一个对象,但是不是json字符串,cartlist的值才是json字符串,所以这里我错了。JSON.parse(里面必须是一个json字符串)
修改后:
onLoad(options){undefined
console.log(options.cartlist); //{"count":1,"total":3,"list":{"2":1}}
let a = JSON.parse(options.cartlist);
console.log(a.count);
}, // 1