JavaScript 字符串处理方法总结

变量从字符串转换成int和float型 

var weightincrease = "2.5kg";
undefined
parseInt(weightincrease);
2
parseFloat(weightincrease);
2.5

字符串处理方法

var words = "鱼神是个帅哥";
undefined
words.length
6
words.charAt(0);
"鱼"
words.charAt(words.length-1);
"哥"

var words = "鱼神是个神帅哥";
undefined
words.indexOf('神');
1
words.lastIndexOf('神');
4

//截图字符串
words.substring(4,6)
"神帅"
//替换字符串
words.replace('是个','无敌')
"鱼神无敌神帅哥"
//按，分割
words= '鱼神无敌,神帅哥'
"鱼神无敌,神帅哥"
words.split(',')
["鱼神无敌", "神帅哥"]
//按,分割给新对象
var newwords = words.split(',')
undefined
newwords
["鱼神无敌", "神帅哥"]
typeof(newwords)
"object"
newwords[0]
"鱼神无敌"
newwords[1]
"神帅哥"