html部分
num1
num2
ans
js部分
window.onload = function(){ var bun = document.getElementById('bun1'); var num1 = document.getElementById('tex1'); var num2 = document.getElementById('tex2'); var num3 = document.getElementById('tex3'); num3.readOnly = true; function swap(){ var tmp = num1.value; num1.value = num2.value; num2.value = tmp; } bun.onclick = function(){ if(num2.value.length > num1.value.length) swap(); if(num2.value > num1.value && num2.value.length == num1.value.length) swap(); var ans = new Array(num1.value.length + 1); ans.fill(0); var zero = ""; for(var i = num2.value.length; i < num1.value.length; i++) zero += '0'; num2.value = zero + num2.value; var cnt = 0; for(var i = num1.value.length - 1; i >= 0; i--){ ans[cnt] += parseInt(num1.value[i]) + parseInt(num2.value[i]); while(ans[cnt] >= 10){ ans[cnt] -= 10; ans[cnt+1]++; } cnt++; } var i; var res=""; for(i = cnt; i >= 0; i--) if(ans[i] != 0) break; if(i == -1) res += '0'; for(; i >= 0; i--) res += ans[i]; num3.value = res; } }
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