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Js calculates the sum of all numbers in the array

Source: Internet
Author: User
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Today, I encountered a problem of calculating the array summation. I always felt that the for loop summation was troublesome. I searched for the problem and thought that this method was good, but the eval here didn't know whether it was good or not.

Join Function

The Code is as follows: Copy code

Var arr = [1, 2, 3, 4, 5, 6];

Var value = eval (arr. join ("+ "));

Of course, we can also use the Traversal method.

Example

The Code is as follows: Copy code

<Title> calculate the sum of all numbers in the array </title>
<Style>
Body {color: #999; font: 12px/1.5 Tahoma ;}
# Outer {width: 500px; margin: 0 auto ;}
# Outer input {padding: 3px; border: 1px solid # ccc; font-family: inherit; width: 220px; margin-right: 10px ;}
. Sum {font-size: 30px; color: red ;}
</Style>
<Script>
Window. onload = function ()
{
Var oBtn = document. getElementsByTagName ("button") [0];
Var oInput = document. getElementsByTagName ("input") [0]
Var oStrong = document. getElementsByTagName ("strong") [0];
OInput. onkeyup = function ()
{
This. value = this. value. replace (/[^ (d) | (,)]/, "")
}
OBtn. onclick = function ()
{
Var sum = 0;
Var oInput = document. getElementsByTagName ("input") [0]. value. split (",");
For (var I in oInput)
{
Sum + = parseInt (oInput [I])
}
OStrong. innerHTML = sum
}
}
</Script>
</Head>
<Body>
<Div id = "outer">
<Label> <input type = "text" value = "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15"/> <span> enter the sum of numbers, numbers are separated by commas (,). </span> </label>
<P> <button> sum </button> </p>
<Strong class = "sum"> </strong>
</Div>

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