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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.
运算问题(加法)(小数后三位)300.022+400=700.0219999999999。
Page({ 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 }, 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 }); }})
电脑二进制计算,精度不够,建议保留两位小数,