运算问题（加法）（小数后三位）300.022+400=700.0219999999999。

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运算问题（加法）（小数后三位）300.022+400=700.0219999999999。Operation problem (addition) (three decimal places) 300.022+400=700.0219999999999.

// pages/shopping/shopping.jsPage({  /**   * 页面的初始数据   */  data: {    products: [{      title:'普洱茶礼盒装1',      size:'规格：500g 礼盒装',      rmb:300.022,      nub:1    },{      title:'普洱茶礼盒装2',      size:'规格：400g 礼盒装',      rmb:400.00,      nub:1    }],    total: 0      },  /**   * 生命周期函数--监听页面加载   */  onLoad: function (options) {    this.total();  },  total:function(e){    var total = 0;    for(let i in this.data.products){      total+= (this.data.products[i].rmb*this.data.products[i].nub);      console.log(total);    };    this.setData({      products: this.data.products,      total:total    });  }})

// pages/shopping/ shopping.jsPage ({/ * * * page initial data * / data: {products: [{Title: 'Pu'er tea gift box 1', size: 'specification: 500g gift box', rmb:300.022 , nub:1 }, {Title: 'Pu'er tea gift box 2', size: 'specification: 400g gift box', rmb:400.00 , nub:1 }], total: 0 }, /*** lifecycle function -- listen to page load * / onload: function (options){ this.total (); }, total:function (e){ var total = 0; for(let i in this.data.products ){ total+= ( this.data.products [i].rmb* this.data.products [i].nub); console.log (total); }; this.setData ({ products: this.data.products , total:total }); }})

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