我正在尝试将 formgoup 中的值发布到 php 页面，最终保存在 mysql 数据库中。当我尝试 POST 时，我不断收到错误响应：SyntaxError: Unexpected token a in JSON at position 41    at JSON.parse (<anonymous>)    at XMLHttpRequest.onLoad (http://localhost:8100/vendor.js:9017:51)    at ZoneDelegate.invokeTask (http://localhost:8100/polyfills.js:3505:35)    at Object.onInvokeTask (http://localhost:8100/vendor.js:75756:33)    at ZoneDelegate.invokeTask (http://localhost:8100/polyfills.js:3504:40)    at Zone.runTask (http://localhost:8100/polyfills.js:3273:51)    at ZoneTask.invokeTask [as invoke] (http://localhost:8100/polyfills.js:3586:38)    at invokeTask (http://localhost:8100/polyfills.js:4727:18)    at XMLHttpRequest.globalZoneAwareCallback (http://localhost:8100/polyfills.js:4764:25)我在离子应用程序中使用的代码是：        let body = {            fullname: this.slideOneForm.value['fullName'],            gender: this.slideOneForm.value['gender'],            age: this.slideOneForm.value['age'],            mstatus: this.slideOneForm.value['mstatus'],            flocation: this.slideOneForm.value['flocation'],            telno: this.slideOneForm.value['telno'],            email: this.slideOneForm.value['email'],            username: this.slideOneForm.value['username'],            password: this.slideOneForm.value['password'],            enterprise1: this.selected_enterprises[0],            enterprise2: this.selected_enterprises[1],            enterprise3: this.selected_enterprises[2],            farmstock1: this.slideTwoForm.value['farm_stock'][0],                };