我有一个角foreach循环,我想打破循环,如果我匹配一个值。下面的代码不能工作。
angular.forEach([0,1,2], function(count){
if(count == 1){
break;
}
});
我怎样才能得到这个?
我有一个角foreach循环,我想打破循环,如果我匹配一个值。下面的代码不能工作。
angular.forEach([0,1,2], function(count){
if(count == 1){
break;
}
});
我怎样才能得到这个?
当前回答
break在angular forEach中是不可能实现的,我们需要修改forEach来实现。
$scope.myuser = [{name: "Ravi"}, {name: "Bhushan"}, {name: "Thakur"}];
angular.forEach($scope.myuser, function(name){
if(name == "Bhushan") {
alert(name);
return forEach.break();
//break() is a function that returns an immutable object,e.g. an empty string
}
});
其他回答
使用Array Some方法
var exists = [0,1,2].some(function(count){
return count == 1
});
Exists将返回true,您可以将其用作函数中的变量
if(exists){
console.log('this is true!')
}
数组一些方法- Javascript
var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];
var keepGoing = true;
ary.forEach(function(value, index, _ary) {
console.log(index)
keepGoing = true;
ary.forEach(function(value, index, _ary) {
if(keepGoing){
if(index==2){
keepGoing=false;
}
else{
console.log(value)
}
}
});
});
请使用ForEach的一些或所有实例,
Array.prototype.some:
some is much the same as forEach but it break when the callback returns true
Array.prototype.every:
every is almost identical to some except it's expecting false to break the loop.
例如:
var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];
ary.some(function (value, index, _ary) {
console.log(index + ": " + value);
return value === "JavaScript";
});
每个的例子:
var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];
ary.every(function(value, index, _ary) {
console.log(index + ": " + value);
return value.indexOf("Script") > -1;
});
查找更多信息 http://www.jsnoob.com/2013/11/26/how-to-break-the-foreach/
onSelectionChanged(event) {
let selectdata = event['api']['immutableService']['gridOptionsWrapper']['gridOptions']['rowData'];
let selected_flag = 0;
selectdata.forEach(data => {
if (data.selected == true) {
selected_flag = 1;
}
});
if (selected_flag == 1) {
this.showForms = true;
} else {
this.showForms = false;
}
}
break在angular forEach中是不可能实现的,我们需要修改forEach来实现。
$scope.myuser = [{name: "Ravi"}, {name: "Bhushan"}, {name: "Thakur"}];
angular.forEach($scope.myuser, function(name){
if(name == "Bhushan") {
alert(name);
return forEach.break();
//break() is a function that returns an immutable object,e.g. an empty string
}
});