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---错误例子---
1)这里的return并不是返回让check 提前结束
var data = [1, 2, 3, 4];
function check(){
data.forEach(function (val, i, arr) {
if(val == 1){
console.log('find');
return; // 这里的return并不是返回让check 提前结束
}
});
console.log('no find');
}
check();
/**
find
no find
*/
2)这里的return并不是返回让forEach提前结束
var data = [1, 2, 3, 4];
function check(){
data.forEach(function (val, i, arr) {
console.log('find');
return;
});
console.log('no find');
}
check();
/**
find
find
find
find
no find
*/
3)错误用法
var data = [1, 2, 3, 4];
function check(){
data.forEach(function (val, i, arr) {
console.log('find');
return;
});
console.log('no find');
}
check();
/**
find
find
find
find
no find
*/
---正确写法---
var data = [1, 2, 3, 4];
function check(){
for(var i = 0; i < data.length; i++){
var val = data[i];
console.log('find');
return;
}
console.log('no find');
}
check();
/**
find
*/