js字符串问题
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所有回答(3)
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+'s1' + +'s2'
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数字字符串转为number类型，在前面加个+号就行，
`
var numArr=["1","2","3","4"];
var sum=0;
numArr.forEach(d=>{
sum+=+d;
})
console.log(sum)
`
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