Understand the difference between JOSN.parse() and JSON.stringify() and solve [object, object] problems

Understand the difference between JOSN.parse() and JSON.stringify()

and solve the [object, object] problem

• JOSN.parse(): used to JSON 字符串convert to对象

• JSON.stringify(): used to 对象/数组convert toJSON 字符串

When receiving data, [object, object] appears in printing because we originally passed an object, and the object was converted into a string during the transmission process. [object, object] is the string form of the object. This can usually be parsed using JSON.stringify().

• For example: When using route jump to pass parameters in uniapp, when we pass an object;

  ​ You can use JSON.stringify when transferring to the jump page, first convert the data into JSON format;

  ​ Then use JSON.parse on the receiving page to parse the data into objects.

  // 页面 A 跳转传参
  let obj={
        
        
      index: this.index,
      value: value
  }
  uni.navigateTo({
        
         
  	url: `/pages/A/A?obj=${
          
          JSON.stringify(obj)}`
  })
  

  // 页面 B 接收
  onLoad(options) {
        
         
  	console.log(JSON.parse(options.obj))
  }