ForEach breaks out of the loop

The source data is an array when the form is validated, and if one fails, the loop is broken

But forEach does not break out of the loop by using a return

ForEach breaks out of the loop:

For forEach, filter,map loops, try catch is used

Or use for,some,every instead

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ForEach returns an error if a break is used (filter,map) and a return does not break the loop

Because all three methods are functions

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try { var array = ["first", "second", "third", "fourth"]; array.forEach(function (item, index) { if (item == "third") { throw new Error("ending"); } else {console.log(item); {if}})} the catch (e) (e.m essage = = "ending") {the console. The log (" jump out of the loop..." ); Var arr = [1, 2, 3, 4, 5]; var arr = [1, 2, 3, 4, 5]; var num = 3; arr.some(function (v) { if (v == num) { return true; } console.log(v); }); Var arr = [1, 2, 3, 4, 5]; var num = 3; arr.every(function (v) { if (v == num) { return false; } else { console.log(v); return true; }});Copy the code