var a = “abc def ghi”;首字母大写的两种方法

1

<script type="text/javascript">

var a = "abc def ghi";

var array1 = a.split(" ");

for(var i = 0 ; i<array1.length; i++){

var temp = array1[i].split('');

temp.unshift(temp.shift().toUpperCase())

array1[i] = temp;

}

var b = array1[0].concat([' '],array1[1],[' '],array1[2]).join('');

alert(b);

</script>

2

<script type="text/javascript">

var a = "abc def ghi";

var array1 = a.split("");

alert(array1);

for(var i = 0 ; i<array1.length; i++){

var temp = array1[i].split('');

var up = temp[0].toUpperCase();

array1[i] = up+temp[1]+temp[2];

}

var b = array1[0]+array1[1]+array1[2];

alert(b);

3

<script type="text/javascript">

var a = "abc def ghi";

var array1 = a.split(" ");

for(var i = 0 ; i<array1.length; i++){

array1[i] = array1[i].substring(0,1).toUpperCase()+array1[i].substring(1);

}

var b = array1[0].concat([' '],array1[1],[' '],array1[2]);

alert(b);

</script>