<script>
function sumadd()
{
var jiben = Number(document.getElementById("jiben").value);
var buzhu1 = Number(document.getElementById("buzhu1").value);
var buzhu2 = Number(document.getElementById("buzhu2").value);
var buzhu3 = Number(document.getElementById("buzhu3").value);
document.getElementById("sum").value = jiben+buzhu1+buzhu2+buzhu3;
}
</script>
<form >
基本工资:<input type="text" name="jiben" onblur="sumadd()"><br>
补助1:<input type="text" name="buzhu1" onblur="sumadd()"><br>
补助2:<input type="text" name="buzhu2" onblur="sumadd()"><br>
补助3:<input type="text" name="buzhu3" onblur="sumadd()"><br>
总和是:<input type="text" name="sum"><br>
</form>
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