数组中的每一项都是一个数字:
var items = Array(523,3452,334,31, ...5346);
如何用新物品替换旧物品?
例如，我们想用1010替换3452，该怎么做呢?
当前回答
presentPrompt(id,productqty) {
let alert = this.forgotCtrl.create({
title: 'Test',
inputs: [
{
name: 'pickqty',
placeholder: 'pick quantity'
},
{
name: 'state',
value: 'verified',
disabled:true,
placeholder: 'state',
}
],
buttons: [
{
text: 'Ok',
role: 'cancel',
handler: data => {
console.log('dataaaaname',data.pickqty);
console.log('dataaaapwd',data.state);
for (var i = 0; i < this.cottonLists.length; i++){
if (this.cottonLists[i].id == id){
this.cottonLists[i].real_stock = data.pickqty;
}
}
for (var i = 0; i < this.cottonLists.length; i++){
if (this.cottonLists[i].id == id){
this.cottonLists[i].state = 'verified';
}
}
//Log object to console again.
console.log("After update: ", this.cottonLists)
console.log('Ok clicked');
}
},
]
});
alert.present();
}
As per your requirement you can change fields and array names.
thats all. Enjoy your coding.
其他回答
presentPrompt(id,productqty) {
let alert = this.forgotCtrl.create({
title: 'Test',
inputs: [
{
name: 'pickqty',
placeholder: 'pick quantity'
},
{
name: 'state',
value: 'verified',
disabled:true,
placeholder: 'state',
}
],
buttons: [
{
text: 'Ok',
role: 'cancel',
handler: data => {
console.log('dataaaaname',data.pickqty);
console.log('dataaaapwd',data.state);
for (var i = 0; i < this.cottonLists.length; i++){
if (this.cottonLists[i].id == id){
this.cottonLists[i].real_stock = data.pickqty;
}
}
for (var i = 0; i < this.cottonLists.length; i++){
if (this.cottonLists[i].id == id){
this.cottonLists[i].state = 'verified';
}
}
//Log object to console again.
console.log("After update: ", this.cottonLists)
console.log('Ok clicked');
}
},
]
});
alert.present();
}
As per your requirement you can change fields and array names.
thats all. Enjoy your coding.
var items = Array(523,3452,334,31,5346);
如果你知道它的价值，
items[items.indexOf(334)] = 1010;
如果你想知道这个值是否存在，那么使用，
var point = items.indexOf(334);
if (point !== -1) {
items[point] = 1010;
}
如果你知道地点(位置)，那么直接使用，
items[--position] = 1010;
如果你想替换一些元素，你知道起始位置只意味着，
items.splice(2, 1, 1010, 1220);
有关.splice的更多信息
最简单的方法是这样。
var items = Array(523,3452,334,31, 5346);
var replaceWhat = 3452, replaceWith = 1010;
if ( ( i = items.indexOf(replaceWhat) ) >=0 ) items.splice(i, 1, replaceWith);
console.log(items);
>>> (5) [523, 1010, 334, 31, 5346]
如果使用一个复杂的对象(甚至是一个简单的对象)，你可以使用es6, Array.prototype.findIndex是一个很好的选择。对于OP的数组，他们可以这样做，
const index = items.findIndex(x => x === 3452)
items[index] = 1010
对于更复杂的对象，这真的很管用。例如,
const index =
items.findIndex(
x => x.jerseyNumber === 9 && x.school === 'Ohio State'
)
items[index].lastName = 'Utah'
items[index].firstName = 'Johnny'
使用indexOf查找元素。
var i = items.indexOf(3452);
items[i] = 1010;
